diff --git a/Descent3/LoadLevel.cpp b/Descent3/LoadLevel.cpp
index 411e8ed2d..02ac3bdd3 100644
--- a/Descent3/LoadLevel.cpp
+++ b/Descent3/LoadLevel.cpp
@@ -1459,7 +1459,7 @@ tConvertObject object_convert[] = {
 
 int object_convert_size = sizeof(object_convert) / sizeof(tConvertObject);
 
-int chunk_start, chunk_size, filelen;
+uint32_t chunk_start, chunk_size, filelen;
 
 int CountDataToPageIn();
 
@@ -2648,7 +2648,44 @@ void BuildXlateTable(CFILE *ifile, int (*lookup_func)(const char *), int16_t *xl
     xlate_table[i] = -1;
 }
 
-#define ISCHUNK(name) (!strncmp(chunk_name, name, 4))
+#define ISCHUNK(name) (strncmp(chunk_name, name, 4) == 0)
+
+/**
+ * Read and check level header
+ * @param fp file handle of level
+ * @return version of level, -1 on error
+ */
+int ReadHeader(CFILE *fp) {
+  // Read & check tag
+  char chunk_name[4];
+  cf_ReadBytes((uint8_t *)chunk_name, 4, fp);
+  if (!ISCHUNK(LEVEL_FILE_TAG)) {
+    return -1;
+  }
+
+  // Read version number
+  int version = cf_ReadInt(fp);
+  return version;
+}
+
+void ReadInfoChunk(CFILE *fp, level_info &info) {
+  // Initialize info
+  strcpy(info.name, "Unnamed");
+  strcpy(info.designer, "Anonymous");
+  strcpy(info.copyright, "");
+  strcpy(info.notes, "");
+
+  cf_ReadString(info.name, sizeof(info.name), fp);
+
+  // Localize level name here...
+  strcpy(info.name, LocalizeLevelName(info.name));
+
+  cf_ReadString(info.designer, sizeof(info.designer), fp);
+  cf_ReadString(info.copyright, sizeof(info.copyright), fp);
+  cf_ReadString(info.notes, sizeof(info.notes), fp);
+}
+
+
 
 // Reads info about our lightmaps
 void ReadNewLightmapChunk(CFILE *fp, int version) {
@@ -3588,6 +3625,60 @@ static inline char* GetCurrentSumString() {
   return output_buf;
 }
 
+bool LoadLevelInfo(const std::filesystem::path &filename, level_info &info) {
+  CFILE *ifile = cfopen(filename, "rb");
+  bool found = false;
+
+  if (!ifile) {
+    LOG_ERROR.printf("Failed to open mission file %s", filename.u8string().c_str());
+    return false;
+  }
+
+  try {
+    // catch cfile errors
+
+    // Read and check header
+    int version = ReadHeader(ifile);
+
+    if (version > LEVEL_FILE_VERSION) {
+      LOG_ERROR.printf("Mission file too new (version %d)", version);
+      cfclose(ifile);
+      return false;
+    }
+    if (version < LEVEL_FILE_OLDEST_COMPATIBLE_VERSION) {
+      LOG_ERROR.printf("Mission file too old (version %d)", version);
+      cfclose(ifile);
+      return false;
+    }
+
+    while (!cfeof(ifile)) {
+      char chunk_name[4];
+
+      cf_ReadBytes((uint8_t *)chunk_name, 4, ifile);
+      chunk_start = cftell(ifile);
+      chunk_size = cf_ReadInt(ifile);
+
+      if (ISCHUNK(CHUNK_LEVEL_INFO)) {
+        ReadInfoChunk(ifile, info);
+        found = true;
+        break;
+      } else {
+        cfseek(ifile, chunk_start + chunk_size, SEEK_SET);
+      }
+    }
+
+  } catch (cfile_error *cfe) {
+    LOG_FATAL.printf("Error reading: file = <%s>, error = \"%s\"", cfe->file->name, cfe->msg);
+    ASSERT(cfe->read_write == CFE_READING);
+    cfclose(ifile);
+    return false;
+  }
+
+  cfclose(ifile);
+  return found;
+}
+
+
 extern bool Disable_editor_rendering;
 
 #define LEVEL_LOADED_PCT_CALC (filelen) ? (float)(chunk_size + chunk_start) / (float)filelen : 0.0f
@@ -3620,19 +3711,11 @@ int LoadLevel(char *filename, void (*cb_fn)(const char *, int, int)) {
 
     filelen = cfilelength(ifile);
 
-    // Read & check tag
-    cf_ReadBytes((uint8_t *)tag, 4, ifile);
-    if (strncmp(tag, LEVEL_FILE_TAG, 4)) {
-      cfclose(ifile);
-      retval = 0;
-      goto end_loadlevel;
-    }
-
-    // Read & check version number
-    version = cf_ReadInt(ifile);
+    version = ReadHeader(ifile);
 
-    // Check for too-new version
+    // Check for too new version
     if (version > LEVEL_FILE_VERSION) {
+      LOG_ERROR.printf("Mission file too new (version %d)", version);
       cfclose(ifile);
 #if (defined(EDITOR) || defined(NEWEDITOR))
       if (GetFunctionMode() == EDITOR_MODE)
@@ -3645,6 +3728,7 @@ int LoadLevel(char *filename, void (*cb_fn)(const char *, int, int)) {
 
     // Check for too-old version
     if (version < LEVEL_FILE_OLDEST_COMPATIBLE_VERSION) {
+      LOG_ERROR.printf("Mission file too old (version %d)", version);
       cfclose(ifile);
 #if (defined(EDITOR) || defined(NEWEDITOR))
       if (GetFunctionMode() == EDITOR_MODE)
@@ -3690,12 +3774,6 @@ int LoadLevel(char *filename, void (*cb_fn)(const char *, int, int)) {
     // Clear terrain sounds
     ClearTerrainSound();
 
-    // Init level info
-    strcpy(Level_info.name, "Unnamed");
-    strcpy(Level_info.designer, "Anonymous");
-    strcpy(Level_info.copyright, "");
-    strcpy(Level_info.notes, "");
-
     BOA_AABB_checksum = BOA_mine_checksum = 0;
     for (i = 0; i < MAX_ROOMS; i++) {
       BOA_AABB_ROOM_checksum[i] = 0;
@@ -3929,14 +4007,7 @@ int LoadLevel(char *filename, void (*cb_fn)(const char *, int, int)) {
       } else if (ISCHUNK(CHUNK_TERRAIN)) {
         ReadTerrainChunks(ifile, version);
       } else if (ISCHUNK(CHUNK_LEVEL_INFO)) {
-        cf_ReadString(Level_info.name, sizeof(Level_info.name), ifile);
-
-        // Localize level name here...
-        strcpy(Level_info.name, LocalizeLevelName(Level_info.name));
-
-        cf_ReadString(Level_info.designer, sizeof(Level_info.designer), ifile);
-        cf_ReadString(Level_info.copyright, sizeof(Level_info.copyright), ifile);
-        cf_ReadString(Level_info.notes, sizeof(Level_info.notes), ifile);
+        ReadInfoChunk(ifile, Level_info);
 
         if (version >= 83) {
           Gravity_strength = cf_ReadFloat(ifile);
diff --git a/Descent3/LoadLevel.h b/Descent3/LoadLevel.h
index 054b5af44..c4f67728f 100644
--- a/Descent3/LoadLevel.h
+++ b/Descent3/LoadLevel.h
@@ -444,6 +444,7 @@
  */
 
 #include "cfile.h"
+#include "Mission.h"
 #include "room.h"
 
 // Chunk types
@@ -634,6 +635,15 @@
 // 130->131 Added the powerups ignore gravity checkbox
 // 131->132 Added another ff bounce texture for Dan (his last day wish)
 
+/**
+ * Get information from level such as level name, author copyrights and notes.
+ * This function much lighter that LoadLevel() and gets only INFO chunk from mission.
+ * @param filename name of mission file
+ * @param info resulted info
+ * @return true on success
+ */
+bool LoadLevelInfo(const std::filesystem::path &filename, level_info &info);
+
 // Load a level file
 // Returns 1 if file read ok, else 0
 // cb_fn returns current chunk, parm1 = # bytes in chunk, parm2 = number of bytes in file
diff --git a/Descent3/Mission.cpp b/Descent3/Mission.cpp
index 582a0082f..f10a5b051 100644
--- a/Descent3/Mission.cpp
+++ b/Descent3/Mission.cpp
@@ -1,5 +1,5 @@
 /*
-* Descent 3 
+* Descent 3
 * Copyright (C) 2024 Parallax Software
 *
 * This program is free software: you can redistribute it and/or modify
@@ -649,7 +649,6 @@
 #include "gamefont.h"
 #include "grdefs.h"
 #include "descent.h"
-#include "ddio.h"
 #include "d3movie.h"
 #include "program.h"
 #include "ObjScript.h"
@@ -672,51 +671,45 @@
 #include "terrain.h"
 #include "multi.h"
 #include "hud.h"
+#include "localization.h"
+#include "levelgoal.h"
+
 //	---------------------------------------------------------------------------
 //	Data
 //	---------------------------------------------------------------------------
 // Info about the current level
 level_info Level_info;
 tMission Current_mission;
-tLevelNode *Current_level = NULL;
-char D3MissionsDir[_MAX_PATH];
+tLevelNode *Current_level = nullptr;
+std::filesystem::path D3MissionsDir;
 extern int Times_game_restored;
 extern msn_urls Net_msn_URLs;
 
 //	---------------------------------------------------------------------------
 //	Function prototypes
 //	---------------------------------------------------------------------------
-bool InitMissionScript();
-void DoEndMission();
-void DoMissionMovie(const char *movie);
+
 void FreeMission();
 // used in load level callback
 void LoadLevelCB(const char *chunk, int curlen, int filelen);
-//	MN3 based mission functions.
-// loads the msn file from the mn3 file specified, specifies the hog and table file.
-bool mn3_Open(const char *mn3file);
+
+// MN3 based mission functions.
+
 // returns mission information given the mn3 file.
-bool mn3_GetInfo(const char *mn3file, tMissionInfo *msn);
-// closes the current mn3 file
-void mn3_Close();
+bool mn3_GetInfo(const std::filesystem::path &mn3file, tMissionInfo *msn);
 
-static inline bool IS_MN3_FILE(const char *fname) {
-  char name[PSFILENAME_LEN + 1];
-  char ext[PSFILENAME_LEN + 1];
-  ddio_SplitPath(fname, NULL, name, ext);
-  return (stricmp(ext, ".mn3") == 0) ? true : false;
+static inline bool IS_MN3_FILE(const std::filesystem::path &fname) {
+  std::filesystem::path ext = fname.extension();
+  return (stricmp(ext.u8string().c_str(), ".mn3") == 0);
 }
 
-static inline char *MN3_TO_MSN_NAME(const char *mn3name, char *msnname) {
-  char fname[PSFILENAME_LEN + 1];
-  ddio_SplitPath(mn3name, NULL, fname, NULL);
-
-  if (stricmp(fname, "d3_2") == 0) {
-    strcpy(fname, "d3");
+static inline std::filesystem::path MN3_TO_MSN_NAME(const std::filesystem::path &mn3name) {
+  std::filesystem::path fname = std::filesystem::path(mn3name).stem();
+  if (stricmp(fname.u8string().c_str(), "d3_2") == 0) {
+    fname = "d3";
   }
-  strcat(fname, ".msn");
-  strcpy(msnname, fname);
-  return msnname;
+  fname.replace_extension(".msn");
+  return fname;
 }
 
 //	---------------------------------------------------------------------------
@@ -735,13 +728,12 @@ void InitMission() {
   memset(Current_mission.author, 0, MSN_NAMELEN);
   memset(Current_mission.email, 0, MSN_URLLEN);
   memset(Current_mission.web, 0, MSN_URLLEN);
-  Current_mission.hog = NULL;
-  Current_mission.levels = NULL;
-  Current_mission.filename = NULL;
+  Current_mission.hog = nullptr;
+  Current_mission.filename = nullptr;
   Current_mission.game_state_flags = 0;
   Current_mission.mn3_handle = 0;
   //	create add on mission directory
-  ddio_MakePath(D3MissionsDir, LocalD3Dir, "missions", NULL);
+  D3MissionsDir = std::filesystem::path(LocalD3Dir) / "missions";
   std::error_code ec;
   std::filesystem::create_directories(D3MissionsDir, ec);
   if (ec) {
@@ -760,33 +752,32 @@ void ResetMission() {
   memset(Current_mission.author, 0, MSN_NAMELEN);
   memset(Current_mission.email, 0, MSN_URLLEN);
   memset(Current_mission.web, 0, MSN_URLLEN);
-  Current_mission.hog = NULL;
-  Current_mission.levels = NULL;
-  Current_mission.filename = NULL;
+  Current_mission.hog = nullptr;
+  Current_mission.levels.clear();
+  Current_mission.filename = nullptr;
   Current_mission.game_state_flags = 0;
 
   // clear out old URLs from memory
-  for (int a = 0; a < MAX_MISSION_URL_COUNT; a++) {
-    Net_msn_URLs.URL[a][0] = '\0';
+  for (auto &a : Net_msn_URLs.URL) {
+    a[0] = '\0';
   }
 }
+
 #if (defined(OEM) || defined(DEMO))
 bool DemoMission(int mode = 0) {
   tMission *msn = &Current_mission;
-  tLevelNode *lvls = mem_rmalloc<tLevelNode>(5);
   msn->cur_level = 1;
   msn->num_levels = 1;
-  msn->levels = lvls;
+  msn->levels.reserve(5);
 
   msn->multiplayable = true;
   msn->singleplayable = true;
 
-  memset(lvls, 0, sizeof(tLevelNode) * msn->num_levels);
   strncpy(msn->author, "Outrage", MSN_NAMELEN - 1);
-  if (!mode) {
+  switch (mode) {
+  case 0: {
     strcpy(msn->name, "Descent 3: Sol Ascent");
     msn->num_levels = 5;
-    memset(lvls, 0, sizeof(tLevelNode) * msn->num_levels);
 #ifdef DEMO
     msn->multiplayable = false;
     strcpy(msn->name, "Descent 3: Demo2");
@@ -797,82 +788,91 @@ bool DemoMission(int mode = 0) {
     msn->num_levels = 5;
     msn->filename = mem_strdup("d3oem.mn3");
 #endif
-    // strncpy(lvls[0].name, "Search for Sweitzer", MSN_NAMELEN-1);
-    lvls[0].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
-    lvls[0].filename = mem_strdup("level1.d3l");
-    lvls[0].briefname = mem_strdup("level1.brf");
-    lvls[0].score = mem_strdup("level1.omf");
-    lvls[0].progress = mem_strdup("l1load.ogf");
-    lvls[0].moviename = mem_strdup("level1.mve");
+    // strncpy(msn->levels[0].name, "Search for Sweitzer", MSN_NAMELEN-1);
+    msn->levels[0].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
+    msn->levels[0].filename = mem_strdup("level1.d3l");
+    msn->levels[0].briefname = mem_strdup("level1.brf");
+    msn->levels[0].score = mem_strdup("level1.omf");
+    msn->levels[0].progress = mem_strdup("l1load.ogf");
+    msn->levels[0].moviename = mem_strdup("level1.mve");
 #ifndef DEMO
-    // strncpy(lvls[0].name, "Into the Heart of the Ship", MSN_NAMELEN-1);
-    lvls[1].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
-    lvls[1].filename = mem_strdup("level3.d3l");
-    lvls[1].briefname = mem_strdup("level2o.brf");
-    lvls[1].score = mem_strdup("level3.omf");
-    lvls[1].progress = mem_strdup("l3load.ogf");
-    // strncpy(lvls[0].name, "The Nomad Caves", MSN_NAMELEN-1);
-    lvls[2].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
-    lvls[2].filename = mem_strdup("level6.d3l");
-    lvls[2].briefname = mem_strdup("level3o.brf");
-    lvls[2].score = mem_strdup("level6.omf");
-    lvls[2].progress = mem_strdup("l6load.ogf");
-    // strncpy(lvls[0].name, "The Transmode Virus", MSN_NAMELEN-1);
-    lvls[3].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
-    lvls[3].filename = mem_strdup("level7.d3l");
-    lvls[3].briefname = mem_strdup("level4o.brf");
-    lvls[3].score = mem_strdup("level7.omf");
-    lvls[3].progress = mem_strdup("l7load.ogf");
-    // strncpy(lvls[0].name, "The Rescue", MSN_NAMELEN-1);
-    lvls[4].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
-    lvls[4].filename = mem_strdup("level11.d3l");
-    lvls[4].briefname = mem_strdup("level5o.brf");
-    lvls[4].score = mem_strdup("level11.omf");
-    lvls[4].progress = mem_strdup("l11load.ogf");
+    // strncpy(msn->levels[0].name, "Into the Heart of the Ship", MSN_NAMELEN-1);
+    msn->levels[1].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
+    msn->levels[1].filename = mem_strdup("level3.d3l");
+    msn->levels[1].briefname = mem_strdup("level2o.brf");
+    msn->levels[1].score = mem_strdup("level3.omf");
+    msn->levels[1].progress = mem_strdup("l3load.ogf");
+    // strncpy(msn->levels[0].name, "The Nomad Caves", MSN_NAMELEN-1);
+    msn->levels[2].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
+    msn->levels[2].filename = mem_strdup("level6.d3l");
+    msn->levels[2].briefname = mem_strdup("level3o.brf");
+    msn->levels[2].score = mem_strdup("level6.omf");
+    msn->levels[2].progress = mem_strdup("l6load.ogf");
+    // strncpy(msn->levels[0].name, "The Transmode Virus", MSN_NAMELEN-1);
+    msn->levels[3].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
+    msn->levels[3].filename = mem_strdup("level7.d3l");
+    msn->levels[3].briefname = mem_strdup("level4o.brf");
+    msn->levels[3].score = mem_strdup("level7.omf");
+    msn->levels[3].progress = mem_strdup("l7load.ogf");
+    // strncpy(msn->levels[0].name, "The Rescue", MSN_NAMELEN-1);
+    msn->levels[4].flags = LVLFLAG_BRIEFING | LVLFLAG_SCORE;
+    msn->levels[4].filename = mem_strdup("level11.d3l");
+    msn->levels[4].briefname = mem_strdup("level5o.brf");
+    msn->levels[4].score = mem_strdup("level11.omf");
+    msn->levels[4].progress = mem_strdup("l11load.ogf");
     mn3_Open("d3oem.mn3");
 #endif
-
+    break;
   }
-
-  else if (mode == 1) {
+  case 1: {
     strcpy(msn->name, "Polaris");
     msn->filename = mem_strdup("Polaris.d3l");
-    // strncpy(lvls[0].name, "Polaris", MSN_NAMELEN-1);
-    lvls[0].filename = mem_strdup("polaris.d3l");
-    lvls[0].flags |= LVLFLAG_BRANCH;
-    lvls[0].lvlbranch0 = 1;
-    lvls[0].progress = mem_strdup("polaris.ogf");
-  } else if (mode == 2) {
+    // strncpy(msn->levels[0].name, "Polaris", MSN_NAMELEN-1);
+    msn->levels[0].filename = mem_strdup("polaris.d3l");
+    msn->levels[0].flags |= LVLFLAG_BRANCH;
+    msn->levels[0].lvlbranch0 = 1;
+    msn->levels[0].progress = mem_strdup("polaris.ogf");
+    break;
+  }
+  case 2: {
     strcpy(msn->name, "The Core");
     msn->filename = mem_strdup("TheCore.d3l");
-    // strncpy(lvls[0].name, "The Core", MSN_NAMELEN-1);
-    lvls[0].filename = mem_strdup("thecore.d3l");
-    lvls[0].flags |= LVLFLAG_BRANCH;
-    lvls[0].lvlbranch0 = 1;
-    lvls[0].progress = mem_strdup("thecore.ogf");
-  } else if (mode == 3) {
+    // strncpy(msn->levels[0].name, "The Core", MSN_NAMELEN-1);
+    msn->levels[0].filename = mem_strdup("thecore.d3l");
+    msn->levels[0].flags |= LVLFLAG_BRANCH;
+    msn->levels[0].lvlbranch0 = 1;
+    msn->levels[0].progress = mem_strdup("thecore.ogf");
+    break;
+  }
+  case 3: {
     strcpy(msn->name, "Taurus");
     msn->filename = mem_strdup("Taurus.d3l");
-    // strncpy(lvls[0].name, "Taurus", MSN_NAMELEN-1);
-    lvls[0].filename = mem_strdup("taurus.d3l");
-    lvls[0].flags |= LVLFLAG_BRANCH;
-    lvls[0].lvlbranch0 = 1;
-    lvls[0].progress = mem_strdup("taurus.ogf");
+    // strncpy(msn->levels[0].name, "Taurus", MSN_NAMELEN-1);
+    msn->levels[0].filename = mem_strdup("taurus.d3l");
+    msn->levels[0].flags |= LVLFLAG_BRANCH;
+    msn->levels[0].lvlbranch0 = 1;
+    msn->levels[0].progress = mem_strdup("taurus.ogf");
+    break;
   }
 #ifndef DEMO
-  else if (mode == 4) {
+  case 4: {
     strcpy(msn->name, "Pilot Training");
     msn->filename = mem_strdup("training.mn3");
-    // strncpy(lvls[0].name, "Training", MSN_NAMELEN-1);
-    lvls[0].filename = mem_strdup("trainingmission.d3l");
-    lvls[0].briefname = NULL; // mem_strdup("training.brf");
-    lvls[0].flags = 0;
-    lvls[0].lvlbranch0 = 0;
-    lvls[0].progress = mem_strdup("trainingload.ogf");
+    // strncpy(msn->levels[0].name, "Training", MSN_NAMELEN-1);
+    msn->levels[0].filename = mem_strdup("trainingmission.d3l");
+    msn->levels[0].briefname = nullptr; // mem_strdup("training.brf");
+    msn->levels[0].flags = 0;
+    msn->levels[0].lvlbranch0 = 0;
+    msn->levels[0].progress = mem_strdup("trainingload.ogf");
     mn3_Open("training.mn3");
+    break;
   }
 #endif
-  //	load default script here.
+  default:
+    return false;
+  }
+  msn->levels.resize(msn->num_levels);
+  // load default script here.
   InitMissionScript();
   return true;
 }
@@ -881,7 +881,6 @@ bool DemoMission(int mode = 0) {
 bool LoadMission(const char *mssn) {
   Times_game_restored = 0;
   LOG_INFO << "In LoadMission()";
-//	ShowProgressScreen(TXT_LOADINGLEVEL);
 #if (defined(OEM) || defined(DEMO))
 #ifdef OEM
   if (stricmp(mssn, "d3oem.mn3") == 0)
@@ -902,31 +901,28 @@ bool LoadMission(const char *mssn) {
 #endif
 #else
 
-  // #endif
-  tLevelNode *lvls = NULL; // Temporary storage for level data.
   tMission *msn;
-  CFILE *fp = NULL; // Mission file
-  char errtext[80]; // Stores error if unable to read mission
-  char msnfname[_MAX_PATH];
-  char mission[_MAX_PATH];
+  CFILE *fp = nullptr; // Mission file
+  char errtext[80];    // Stores error if unable to read mission
+  std::filesystem::path msnfname;
+  std::filesystem::path mission;
   int srclinenum = 0; // Current line of source.
   int curlvlnum;      // Current level number
   int numlevels;      // Number of levels required to read in.
   int cur_objective;  // current objective reading.
   bool indesc;        // are we in a multi-line block
   bool res = false;   // used to specify if no error has occurred.
-  char pathname[_MAX_PATH];
+  std::filesystem::path pathname;
   ResetMission(); // Reset everything.
-                  // open MN3 if filename passed was an mn3 file.
 
+  // Open MN3 if filename passed was a mn3 file.
   if (IS_MN3_FILE(mssn)) {
-    strcpy(mission, mssn);
-    ddio_MakePath(pathname, "missions", mission, NULL);
+    mission = mssn;
+    pathname = std::filesystem::path("missions") / mission;
   } else {
-    strcpy(mission, mssn);
-    strcpy(pathname, mssn);
-    strcpy(msnfname, mssn);
-    // ddio_MakePath(pathname, D3MissionsDir, mission, NULL);
+    mission = mssn;
+    pathname = mssn;
+    msnfname = mssn;
   }
   if (IS_MN3_FILE(mission)) {
 
@@ -934,7 +930,7 @@ bool LoadMission(const char *mssn) {
       strcpy(errtext, TXT_MSN_OPENMN3FAILED);
       goto msnfile_error;
     }
-    MN3_TO_MSN_NAME(mission, msnfname);
+    msnfname = MN3_TO_MSN_NAME(mission);
   }
   //	open mission file
   fp = cfopen(msnfname, "rt");
@@ -948,11 +944,12 @@ bool LoadMission(const char *mssn) {
   srclinenum = 1;
   numlevels = -1;
   curlvlnum = 0;
-  indesc = 0;
+  indesc = false;
   cur_objective = -1;
   msn->multiplayable = true;
   msn->singleplayable = true;
   msn->training_mission = false;
+  msn->levels.reserve(50); // Reserve some place before we know actual number of levels
 
   while (!cfeof(fp)) {
     char srcline[128]; // One line of mission source
@@ -968,7 +965,7 @@ bool LoadMission(const char *mssn) {
       CleanupStr(command, srcline, sizeof(command));
       CleanupStr(operand, srcline + strlen(command) + 1, sizeof(operand));
       if (strlen(command) && indesc)
-        indesc = 0;
+        indesc = false;
       if (!stricmp(command, "NAME")) {
         strncpy(msn->name, operand, MSN_NAMELEN - 1);
       } else if (!stricmp(command, "MULTI")) {
@@ -994,16 +991,16 @@ bool LoadMission(const char *mssn) {
         strcat(msn->desc, operand);
         if (indesc)
           strcat(msn->desc, "\n");
-        indesc = 1; // this is a multiline command
+        indesc = true; // this is a multiline command
       } else if (!stricmp(command, "URL")) {
         if (curlvlnum != 0) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          for (int a = 0; a < MAX_MISSION_URL_COUNT; a++) {
-            if (Net_msn_URLs.URL[a][0] == '\0') {
-              strncpy(Net_msn_URLs.URL[a], operand, MAX_MISSION_URL_LEN - 1);
-              Net_msn_URLs.URL[a][MAX_MISSION_URL_LEN - 1] = '\0';
+          for (auto &url : Net_msn_URLs.URL) {
+            if (url[0] == '\0') {
+              strncpy(url, operand, MAX_MISSION_URL_LEN - 1);
+              url[MAX_MISSION_URL_LEN - 1] = '\0';
               LOG_INFO.printf("Found a Mission URL: %s", operand);
               break;
             }
@@ -1036,9 +1033,9 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_SCORE;
-          lvls[curlvlnum - 1].score = mem_strdup(operand);
-          if (!lvls[curlvlnum - 1].score)
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_SCORE;
+          msn->levels[curlvlnum - 1].score = mem_strdup(operand);
+          if (!msn->levels[curlvlnum - 1].score)
             goto fatal_error;
         }
       } else if (!stricmp(command, "PROGRESS")) {
@@ -1046,8 +1043,8 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].progress = mem_strdup(operand);
-          if (!lvls[curlvlnum - 1].progress)
+          msn->levels[curlvlnum - 1].progress = mem_strdup(operand);
+          if (!msn->levels[curlvlnum - 1].progress)
             goto fatal_error;
         }
       } else if (!stricmp(command, "HOG")) {
@@ -1056,8 +1053,8 @@ bool LoadMission(const char *mssn) {
           if (!msn->hog)
             goto fatal_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_SPECIALHOG;
-          if (!(lvls[curlvlnum - 1].hog = mem_strdup(operand)))
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_SPECIALHOG;
+          if (!(msn->levels[curlvlnum - 1].hog = mem_strdup(operand)))
             goto fatal_error;
         }
       } else if (!stricmp(command, "NUMLEVELS")) {
@@ -1071,9 +1068,8 @@ bool LoadMission(const char *mssn) {
             strcpy(errtext, TXT_MSN_LVLNUMINVALID);
             goto msnfile_error;
           }
-          lvls = mem_rmalloc<tLevelNode>(value);
-          memset(lvls, 0, sizeof(tLevelNode) * value);
           numlevels = value;
+          msn->levels.resize(numlevels); // Now we know number of levels, resize vector
         }
       } else if (!stricmp(command, "LEVEL")) {
         // first check if number of level is greater than num_levels
@@ -1082,10 +1078,7 @@ bool LoadMission(const char *mssn) {
           goto msnfile_error;
         }
         curlvlnum = atoi(operand);
-        if (curlvlnum == 0) {
-          strcpy(errtext, TXT_MSN_LVLNUMINVALID);
-          goto msnfile_error;
-        } else if (curlvlnum > numlevels || curlvlnum < 0) {
+        if (curlvlnum > numlevels || curlvlnum <= 0) {
           strcpy(errtext, TXT_MSN_LVLNUMINVALID);
           goto msnfile_error;
         }
@@ -1094,8 +1087,8 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_STARTMOVIE;
-          if (!(lvls[curlvlnum - 1].moviename = mem_strdup(operand)))
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_STARTMOVIE;
+          if (!(msn->levels[curlvlnum - 1].moviename = mem_strdup(operand)))
             goto fatal_error;
         }
       } else if (!stricmp(command, "INTRODEFAULT")) {
@@ -1103,8 +1096,8 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else if (!Descent_overrided_intro) {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_STARTMOVIE;
-          if (!(lvls[curlvlnum - 1].moviename = mem_strdup(operand)))
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_STARTMOVIE;
+          if (!(msn->levels[curlvlnum - 1].moviename = mem_strdup(operand)))
             goto fatal_error;
         }
       } else if (!stricmp(command, "ENDMOVIE")) {
@@ -1112,8 +1105,8 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_ENDMOVIE;
-          if (!(lvls[curlvlnum - 1].endmovie = mem_strdup(operand)))
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_ENDMOVIE;
+          if (!(msn->levels[curlvlnum - 1].endmovie = mem_strdup(operand)))
             goto fatal_error;
         }
       } else if (!stricmp(command, "MINE")) {
@@ -1121,7 +1114,7 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          if (!(lvls[curlvlnum - 1].filename = mem_strdup(operand)))
+          if (!(msn->levels[curlvlnum - 1].filename = mem_strdup(operand)))
             goto fatal_error;
         }
       } else if (!stricmp(command, "SECRET")) {
@@ -1129,16 +1122,16 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_SPAWNSECRET;
-          lvls[curlvlnum - 1].secretlvl = atoi(operand);
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_SPAWNSECRET;
+          msn->levels[curlvlnum - 1].secretlvl = atoi(operand);
         }
       } else if (!stricmp(command, "BRIEFING")) {
         if (curlvlnum == 0) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_BRIEFING;
-          if (!(lvls[curlvlnum - 1].briefname = mem_strdup(operand)))
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_BRIEFING;
+          if (!(msn->levels[curlvlnum - 1].briefname = mem_strdup(operand)))
             goto fatal_error;
         }
       } else if (!stricmp(command, "BRANCH")) {
@@ -1153,14 +1146,14 @@ bool LoadMission(const char *mssn) {
           strcpy(errtext, TXT_MSN_LVLNUMINVALID);
           goto msnfile_error;
         }
-        lvls[curlvlnum - 1].flags |= LVLFLAG_BRANCH;
-        lvls[curlvlnum - 1].lvlbranch0 = lvlnum;
+        msn->levels[curlvlnum - 1].flags |= LVLFLAG_BRANCH;
+        msn->levels[curlvlnum - 1].lvlbranch0 = lvlnum;
       } else if (!stricmp(command, "ENDMISSION")) {
         if (curlvlnum == 0) {
           strcpy(errtext, TXT_MSN_LVLCOMMAND);
           goto msnfile_error;
         } else {
-          lvls[curlvlnum - 1].flags |= LVLFLAG_FINAL;
+          msn->levels[curlvlnum - 1].flags |= LVLFLAG_FINAL;
         }
       } else {
         snprintf(errtext, sizeof(errtext), TXT_MSN_ILLEGALCMD, command);
@@ -1172,12 +1165,12 @@ bool LoadMission(const char *mssn) {
   //	set up current mission (movies are already set above)
   msn->cur_level = 1;
   msn->num_levels = numlevels;
-  msn->levels = lvls;
-  msn->filename = mem_strdup(mission);
+  msn->filename = mem_strdup(mission.u8string().c_str());
   msn->game_state_flags = 0;
-  strcpy(Net_msn_URLs.msnname, mission);
-  res = true; // everthing is ok.
-//	if error, print it out, else end.
+  strcpy(Net_msn_URLs.msnname, mission.u8string().c_str());
+  res = true; // everything is ok.
+
+  // if error, print it out, else end.
 msnfile_error:
   if (!res) {
     char str_text[128];
@@ -1187,8 +1180,6 @@ bool LoadMission(const char *mssn) {
     } else {
       PrintDedicatedMessage("%s: %s\n", TXT_ERROR, str_text);
     }
-    if (lvls)
-      mem_free(lvls);
   }
   if (fp)
     cfclose(fp);
@@ -1203,6 +1194,7 @@ bool LoadMission(const char *mssn) {
 #endif
   return false;
 }
+
 void FreeMission() {
   //	Free up mission script
   int i; //,j;
@@ -1210,52 +1202,43 @@ void FreeMission() {
   mn3_Close();
   // Tell Osiris to shutdown the Osiris Mission Memory System, freeing all memory
   Osiris_CloseOMMS();
-  if (Current_mission.levels) {
-    //	free up any data allocated per level node.
-    for (i = 0; i < Current_mission.num_levels; i++) {
-      if (Current_mission.levels[i].filename)
-        mem_free(Current_mission.levels[i].filename);
-      if (Current_mission.levels[i].briefname)
-        mem_free(Current_mission.levels[i].briefname);
-      if (Current_mission.levels[i].hog)
-        mem_free(Current_mission.levels[i].hog);
-      if (Current_mission.levels[i].moviename)
-        mem_free(Current_mission.levels[i].moviename);
-      if (Current_mission.levels[i].endmovie)
-        mem_free(Current_mission.levels[i].endmovie);
-      if (Current_mission.levels[i].score)
-        mem_free(Current_mission.levels[i].score);
-      if (Current_mission.levels[i].progress)
-        mem_free(Current_mission.levels[i].progress);
-    }
-    mem_free(Current_mission.levels);
-    Current_mission.levels = NULL;
+  // free up any data allocated per level node.
+  for (auto level : Current_mission.levels) {
+    if (level.filename)
+      mem_free(level.filename);
+    if (level.briefname)
+      mem_free(level.briefname);
+    if (level.hog)
+      mem_free(level.hog);
+    if (level.moviename)
+      mem_free(level.moviename);
+    if (level.endmovie)
+      mem_free(level.endmovie);
+    if (level.score)
+      mem_free(level.score);
+    if (level.progress)
+      mem_free(level.progress);
   }
-  //@@	if (Current_mission.d3xmod) {
-  //@@		D3XFreeProgram(Current_mission.d3xmod);
-  //@@		Current_mission.d3xmod = NULL;
-  //@@	}
+  Current_mission.levels.clear();
+
   if (Current_mission.hog)
     mem_free(Current_mission.hog);
   if (Current_mission.filename) {
-    // these DON't USE mem_free since we use _strdup, which doesn't use our memory routines.
     mem_free(Current_mission.filename);
-    Current_mission.filename = NULL;
   }
-  Current_mission.hog = NULL;
-  Current_level = NULL;
+  Current_mission.hog = nullptr;
+  Current_mission.filename = nullptr;
+  Current_level = nullptr;
 }
-#include "localization.h"
-#include "levelgoal.h"
+
 // Load the text (goal strings) for a level
-void LoadLevelText(const char *level_filename) {
-  char pathname[_MAX_FNAME], filename[_MAX_FNAME];
+void LoadLevelText(const std::filesystem::path &level_filename) {
   int n_strings;
-  ddio_SplitPath(level_filename, pathname, filename, NULL);
-  strcat(pathname, filename);
-  strcat(pathname, ".str");
+  std::filesystem::path pathname = level_filename;
+  pathname.replace_extension(".str");
+
   char **goal_strings;
-  if (CreateStringTable(pathname, &goal_strings, &n_strings)) {
+  if (CreateStringTable(pathname.u8string().c_str(), &goal_strings, &n_strings)) {
     int n_goals = Level_goals.GetNumGoals();
     ASSERT(n_strings == (n_goals * 3));
     for (int i = 0; i < n_goals; i++) {
@@ -1272,7 +1255,7 @@ void LoadLevelText(const char *level_filename) {
 bool LoadMissionLevel(int level) {
   Hud_show_controls = false;
   LoadLevelProgress(LOAD_PROGRESS_START, 0);
-  if (!LoadLevel(Current_mission.levels[level - 1].filename, NULL)) {
+  if (!LoadLevel(Current_mission.levels[level - 1].filename, nullptr)) {
     char buf[128];
     snprintf(buf, sizeof(buf), TXT_MSNERROR, Current_mission.levels[level - 1].filename);
     SetUICallback(DEFAULT_UICALLBACK);
@@ -1307,7 +1290,7 @@ bool LoadMissionLevel(int level) {
 #define LOADBAR_W (260 * (float)Max_window_w / (float)FIXED_SCREEN_WIDTH)
 #define LOADBAR_H (22 * (float)Max_window_h / (float)FIXED_SCREEN_HEIGHT)
 #define N_LOAD_MSGS 12
-bool started_page = 0;
+
 /*
 $$TABLE_GAMEFILE "tunnelload.ogf"
 */
@@ -1338,7 +1321,7 @@ void LoadLevelProgress(int step, float percent, const char *chunk) {
     lvl_percent_loaded = 0.0f;
     pag_percent_loaded = 0.0f;
     dedicated_last_string_len = -1;
-    const char *p = NULL;
+    const char *p = nullptr;
     if ((!(Game_mode & GM_MULTI)) && (!Current_mission.levels[Current_mission.cur_level - 1].progress)) {
       p = "tunnelload.ogf";
     } else {
@@ -1352,12 +1335,6 @@ void LoadLevelProgress(int step, float percent, const char *chunk) {
         n_text_msgs = 0;
       }
     }
-    /*
-    else
-    {
-            ShowProgressScreen (TXT_LOADINGLEVEL);
-    }
-    */
     Progress_screen_loaded = true;
     return;
   } break;
@@ -1435,7 +1412,7 @@ void LoadLevelProgress(int step, float percent, const char *chunk) {
 #else
     DrawLargeBitmap(&level_bmp, 0, 0, 1.0f);
 #endif
-    // do relevent text.
+    // do relevant text.
     str[0] = 0;
     if (chunk) {
       if (strncmp(CHUNK_TERRAIN, chunk, strlen(CHUNK_TERRAIN)) == 0)
@@ -1582,17 +1559,20 @@ void LoadLevelProgress(int step, float percent, const char *chunk) {
   EndFrame();
   rend_Flip();
 }
-/*	this functions performs the end mission code
+
+/**
+ * This function performs the end mission code
  */
 void DoEndMission() {
-  if (Game_mode & GM_MULTI) // If multiplayer, just loop
-  {
+  // If multiplayer, just loop
+  if (Game_mode & GM_MULTI) {
     if (Dedicated_server)
       PrintDedicatedMessage(TXT_DS_MISSIONDONE);
     SetCurrentLevel(1);
     return;
   }
 }
+
 // Shows some text on a background, useful for telling the player what is going on
 // ie "Loading level...", "Receiving data...", etc
 void ShowProgressScreen(const char *str, const char *str2, bool flip) {
@@ -1615,6 +1595,7 @@ void ShowProgressScreen(const char *str, const char *str2, bool flip) {
   if (flip)
     rend_Flip();
 }
+
 /*	does a mission briefing, returns if mission was canceled, a false, or 0 value.
         first displays mission goals and some warnings or advice.
         may allow for selection of player ships
@@ -1678,49 +1659,41 @@ bool InitMissionScript() {
   //@@	}
   return true;
 }
+
 extern bool IsRestoredGame;
+
 void InitLevelScript() {
   if (Current_level->filename) {
-    char filename[_MAX_PATH], ext[_MAX_EXT];
-    ddio_SplitPath(Current_level->filename, NULL, filename, ext);
-#if defined(WIN32)
-    strcat(filename, ".dll");
-#elif defined(MACOSX)
-    strcat(filename, ".dylib");
-#elif defined(__LINUX__)
-    strcat(filename, ".so");
-#else
-    #error Unsupported platform!
-#endif
+    std::filesystem::path filename = Current_level->filename;
+    filename.replace_extension(MODULE_EXT);
     Osiris_LoadLevelModule(filename);
   }
-  //@$-D3XExecScript(Current_level->d3xthread, Current_mission.cur_level, REF_LEVELTYPE, EVT_LEVELSTART, 0, 0);
-  tOSIRISEventInfo ei;
+  tOSIRISEventInfo ei{};
   // This is a hack... we don't want the level start script to be called when restoring a save game
   if (!IsRestoredGame)
     Osiris_CallLevelEvent(EVT_LEVELSTART, &ei);
   AssignScriptsForLevel(); // initialize all scripts for level.
 }
+
 void FreeLevelScript() {
   Osiris_UnloadLevelModule();
   if (Current_level) {
     //	free level's script and thread
     //@$-D3XExecScript(Current_level->d3xthread, Current_mission.cur_level, REF_LEVELTYPE, EVT_LEVELEND, 0, 0);
-    tOSIRISEventInfo ei;
+    tOSIRISEventInfo ei{};
     Osiris_CallLevelEvent(EVT_LEVELEND, &ei);
   }
 }
-//	return information about a mission
-bool GetMissionInfo(const char *msnfile, tMissionInfo *msn) {
-  CFILE *fp;
+
+bool GetMissionInfo(const std::filesystem::path &msnfile, tMissionInfo *msn) {
   bool indesc = false; // are we in a multi-line block
   //	open mission file
   if (IS_MN3_FILE(msnfile)) {
     return mn3_GetInfo(msnfile, msn);
   }
-  fp = cfopen(msnfile, "rt");
+  CFILE *fp = cfopen(msnfile, "rt");
   if (!fp) {
-    LOG_WARNING.printf("Failed to open mission file %s in GetMissionInfo.", msnfile);
+    LOG_WARNING.printf("Failed to open mission file %s in GetMissionInfo.", msnfile.u8string().c_str());
     return false;
   }
   msn->multi = true;
@@ -1736,8 +1709,7 @@ bool GetMissionInfo(const char *msnfile, tMissionInfo *msn) {
     int readcount;     // read-in count
     readcount = cf_ReadString(srcline, sizeof(srcline), fp);
     if (readcount) {
-      //	we have a line of source.  parse out primary keyword
-      //	then parse out remainder.
+      // We have a line of source. Parse out primary keyword then parse out remainder.
       keyword = strtok(srcline, " \t");
       CleanupStr(command, srcline, sizeof(command));
       CleanupStr(operand, srcline + strlen(command) + 1, sizeof(operand));
@@ -1756,14 +1728,13 @@ bool GetMissionInfo(const char *msnfile, tMissionInfo *msn) {
       } else if (!stricmp(command, "AUTHOR")) {
         strncpy(msn->author, operand, MSN_NAMELEN - 1);
       } else if (!stricmp(command, "DESCRIPTION") || indesc) {
-        //	multi-line descriptions require the strcat.  the initial
-        //	strings should be empty for this to work.
+        // Multi-line descriptions require the strcat. The initial strings should be empty for this to work.
         strcat(msn->desc, operand);
         if (indesc)
           strcat(msn->desc, "\n");
         indesc = true; // this is a multiline command
       } else if (!stricmp(command, "NUMLEVELS")) {
-        //	get number of levels
+        // Get number of levels
         int value = atoi(operand);
         msn->n_levels = value;
       } else if (!stricmp(command, "LEVEL")) {
@@ -1777,9 +1748,9 @@ bool GetMissionInfo(const char *msnfile, tMissionInfo *msn) {
   cfclose(fp);
   return true;
 }
-//	---------------------------------------------------------------------------
+
 const char *GetMissionName(const char *mission) {
-  tMissionInfo msninfo;
+  tMissionInfo msninfo{};
   static char msnname[MSN_NAMELEN];
   msnname[0] = 0;
   if (GetMissionInfo(mission, &msninfo)) {
@@ -1789,38 +1760,23 @@ const char *GetMissionName(const char *mission) {
   }
   return msnname;
 }
+
 bool IsMissionMultiPlayable(const char *mission) {
-  tMissionInfo msninfo;
+  tMissionInfo msninfo{};
   if (GetMissionInfo(mission, &msninfo)) {
     return msninfo.multi;
   }
   return false;
 }
-bool IsMissionSinglePlayable(const char *mission) {
-  tMissionInfo msninfo;
-  if (GetMissionInfo(mission, &msninfo)) {
-    return msninfo.single;
-  }
-  return false;
-}
+
 int Mission_voice_hog_handle = 0;
-//	MN3 based mission functions.
-// loads the msn file from the mn3 file specified, specifies the hog and table file.
-bool mn3_Open(const char *mn3file) {
-  char pathname[_MAX_PATH];
-  char filename[PSFILENAME_LEN + 1];
-  char ext[PSFILENAME_LEN];
+
+bool mn3_Open(const std::filesystem::path &mn3file) {
   int mn3_handle;
-  // concatanate the mn3 extension if it isn't there.
-  char tempMn3File[_MAX_PATH];
-  if (!IS_MN3_FILE(mn3file)) {
-    strncpy(tempMn3File, mn3file, sizeof(tempMn3File) - 1);
-    tempMn3File[sizeof(tempMn3File) - 1] = 0;
-    strcat(tempMn3File, ".mn3");
-    mn3file = tempMn3File;
-  }
+  // concatenate the mn3 extension if it isn't there.
+  std::filesystem::path tempMn3File = mn3file;
+  tempMn3File.replace_extension(".mn3");
 
-  ddio_MakePath(pathname, D3MissionsDir, mn3file, NULL);
   // open MN3 HOG.
   mn3_handle = cf_OpenLibrary(mn3file);
   if (mn3_handle == 0) {
@@ -1829,42 +1785,43 @@ bool mn3_Open(const char *mn3file) {
     Osiris_ExtractScriptsFromHog(mn3_handle, true);
   }
   // do table file stuff.
-  ddio_SplitPath(mn3file, NULL, filename, ext);
+  std::filesystem::path filename = mn3file.stem();
 
-  char voice_hog[_MAX_PATH*2];
-  if ((stricmp(filename, "d3") == 0) || (stricmp(filename, "training") == 0)) {
+  std::filesystem::path voice_hog;
+  if ((stricmp(filename.u8string().c_str(), "d3") == 0) || (stricmp(filename.u8string().c_str(), "training") == 0)) {
     // Open audio hog file
-    ddio_MakePath(voice_hog, "missions", "d3voice1.hog", nullptr); // Audio for levels 1-4
+    voice_hog = std::filesystem::path("missions") / "d3voice1.hog"; // Audio for levels 1-4
     Mission_voice_hog_handle = cf_OpenLibrary(voice_hog);
-  } else if (stricmp(filename, "d3_2") == 0) {
+  } else if (stricmp(filename.u8string().c_str(), "d3_2") == 0) {
     // Open audio hog file
-    ddio_MakePath(voice_hog, "missions", "d3voice2.hog", nullptr); // Audio for levels 5-17
+    voice_hog = std::filesystem::path("missions") / "d3voice2.hog"; // Audio for levels 5-17
     Mission_voice_hog_handle = cf_OpenLibrary(voice_hog);
   }
-  strcat(filename, ".gam");
-  mng_SetAddonTable(filename);
+  filename.replace_extension(".gam");
+  mng_SetAddonTable(filename.u8string().c_str());
   Current_mission.mn3_handle = mn3_handle;
   return true;
 }
 
 // returns mission information given the mn3 file.
-bool mn3_GetInfo(const char *mn3file, tMissionInfo *msn) {
+bool mn3_GetInfo(const std::filesystem::path &mn3file, tMissionInfo *msn) {
   int handle;
   bool retval;
-  char pathname[_MAX_PATH];
-  char filename[PSFILENAME_LEN + 1];
+  std::filesystem::path pathname;
+  std::filesystem::path filename;
 
-  ddio_MakePath(pathname, "missions", mn3file, nullptr);
+  pathname = std::filesystem::path(std::filesystem::path("missions")) / mn3file;
   handle = cf_OpenLibrary(pathname);
   if (handle == 0) {
     LOG_ERROR << "MISSION: MN3 failed to open.";
     return false;
   }
-  MN3_TO_MSN_NAME(mn3file, filename);
+  filename = MN3_TO_MSN_NAME(mn3file);
   retval = GetMissionInfo(filename, msn);
   cf_CloseLibrary(handle);
   return retval;
 }
+
 // closes the current mn3 file
 void mn3_Close() {
   if (Current_mission.mn3_handle) {
@@ -1877,12 +1834,14 @@ void mn3_Close() {
   }
   Current_mission.mn3_handle = 0;
 }
+
 #define KEYWORD_LEN 16
 #define NUM_KEYWORDS 16
 #define GOALSTEXT "GOALS"
 #define GOALSTEXTLEN strlen(GOALSTEXT)
 #define MODMINGOALS "MINGOALS"
 #define MODMINGOALSLEN strlen(MODMINGOALS)
+
 // Returns the max number of teams this mission can support for this mod, or
 //-1 if this level shouldn't be played with this mission
 // Return values:
@@ -1894,7 +1853,6 @@ int MissionGetKeywords(const char *mission, char *keywords) {
 
   char msn_keywords[NUM_KEYWORDS][KEYWORD_LEN];
   char mod_keywords[NUM_KEYWORDS][KEYWORD_LEN];
-  int i;
   char *parse_keys = mem_strdup(keywords);
   char seps[] = ",";
   int teams = MAX_NET_PLAYERS;
@@ -1903,7 +1861,7 @@ int MissionGetKeywords(const char *mission, char *keywords) {
   int mod_key_count = 0;
   int msn_key_count = 0;
   bool goal_per_team = false;
-  tMissionInfo msn_info;
+  tMissionInfo msn_info{};
 
   memset(msn_keywords, 0, sizeof(msn_keywords));
   memset(mod_keywords, 0, sizeof(mod_keywords));
@@ -1922,7 +1880,7 @@ int MissionGetKeywords(const char *mission, char *keywords) {
     do {
       strcpy(mod_keywords[mod_key_count], tokp);
       mod_key_count++;
-      tokp = strtok(NULL, seps);
+      tokp = strtok(nullptr, seps);
     } while ((tokp) && (mod_key_count < NUM_KEYWORDS));
   }
   // Break up the msn keywords into an array
@@ -1931,38 +1889,38 @@ int MissionGetKeywords(const char *mission, char *keywords) {
     do {
       strcpy(msn_keywords[msn_key_count], tokp);
       msn_key_count++;
-      tokp = strtok(NULL, seps);
+      tokp = strtok(nullptr, seps);
     } while ((tokp) && (msn_key_count < NUM_KEYWORDS));
   }
 
-  for (i = 0; i < NUM_KEYWORDS; i++) {
-    if (msn_keywords[i][0] == 0) {
+  for (auto &msn_keyword : msn_keywords) {
+    if (msn_keyword[0] == 0) {
       continue;
     }
-    if (strnicmp(GOALSTEXT, msn_keywords[i], GOALSTEXTLEN) == 0) {
+    if (strnicmp(GOALSTEXT, msn_keyword, GOALSTEXTLEN) == 0) {
       // Get the number of goals this game has
-      goals = atoi(msn_keywords[i] + GOALSTEXTLEN);
+      goals = atoi(msn_keyword + GOALSTEXTLEN);
     }
   }
   mem_free(parse_keys);
 
   // Loop through looking for matches
-  for (i = 0; i < NUM_KEYWORDS; i++) {
-    if (mod_keywords[i][0] == 0) {
+  for (auto &mod_keyword : mod_keywords) {
+    if (mod_keyword[0] == 0) {
       continue;
     }
-    if (strnicmp(mod_keywords[i], MODMINGOALS, MODMINGOALSLEN) == 0) {
-      goalsneeded = atoi(mod_keywords[i] + MODMINGOALSLEN);
-    } else if (stricmp("GOALPERTEAM", mod_keywords[i]) == 0) {
+    if (strnicmp(mod_keyword, MODMINGOALS, MODMINGOALSLEN) == 0) {
+      goalsneeded = atoi(mod_keyword + MODMINGOALSLEN);
+    } else if (stricmp("GOALPERTEAM", mod_keyword) == 0) {
       goal_per_team = true;
     } else {
       bool found_keyword = false;
       // Loop through looking for matches
-      for (int a = 0; a < NUM_KEYWORDS; a++) {
-        if (msn_keywords[a][0] == 0) {
+      for (auto &msn_keyword : msn_keywords) {
+        if (msn_keyword[0] == 0) {
           continue;
         }
-        if (stricmp(msn_keywords[a], mod_keywords[i]) == 0) {
+        if (stricmp(msn_keyword, mod_keyword) == 0) {
           // Woohoo! it's found
           found_keyword = true;
           break;
@@ -1970,7 +1928,7 @@ int MissionGetKeywords(const char *mission, char *keywords) {
       }
       // We never found one we needed, so return -1;
       if (!found_keyword) {
-        LOG_WARNING.printf("%s keyword needed in %s not found!", mod_keywords[i], mission);
+        LOG_WARNING.printf("%s keyword needed in %s not found!", mod_keyword, mission);
         return -1;
       }
     }
@@ -1988,6 +1946,7 @@ int MissionGetKeywords(const char *mission, char *keywords) {
   }
   return teams;
 }
+
 //////////////////////////////////////////////////////////////////////////////
 #ifdef EDITOR
 //	Used by editor->game to load all necessary elements for level playing for systems
@@ -1999,9 +1958,8 @@ void QuickStartMission() {
   //	this initializes a mini one level mission with no frills.
   Current_mission.cur_level = 1;
   Current_mission.num_levels = 1;
-  Current_mission.levels = mem_rmalloc<tLevelNode>();
-  memset(Current_mission.levels, 0, sizeof(tLevelNode));
-  Current_level = Current_mission.levels;
+  Current_mission.levels.emplace_back(tLevelNode{});
+  Current_level = &Current_mission.levels[0];
   if (Editor_quickplay_levelname[0] != '\0')
     Current_level->filename = mem_strdup(Editor_quickplay_levelname);
   else
diff --git a/Descent3/Mission.h b/Descent3/Mission.h
index 6701ea9ec..d2114f0bc 100644
--- a/Descent3/Mission.h
+++ b/Descent3/Mission.h
@@ -167,6 +167,8 @@
 #ifndef MISSION_H
 #define MISSION_H
 
+#include <vector>
+
 #include "pstypes.h"
 #include "descent.h"
 
@@ -178,10 +180,10 @@
 #define LOAD_PROGRESS_DONE 200
 
 // Load level progress worker
-void LoadLevelProgress(int step, float percent, const char *chunk = NULL);
+void LoadLevelProgress(int step, float percent, const char *chunk = nullptr);
 
-//	array constants
-const int MSN_FILENAMELEN = _MAX_PATH, MSN_URLLEN = 256;
+// Array constants
+const int MSN_URLLEN = 256;
 
 #define MAX_KEYWORDLEN 300
 
@@ -209,22 +211,22 @@ extern level_info Level_info;
 
 //	level information
 struct tLevelNode {
-  //	level flags
-  unsigned flags;           // level flags
-  unsigned objective_flags; // level objective flags
+  // Level flags
+  uint32_t flags;           // level flags
+  uint32_t objective_flags; // level objective flags
 
-  //	movies
+  // Movies
   char *moviename;
   char *endmovie;
 
-  //	level filename
+  // Level filename
   char *filename;  // mine filename.
   char *briefname; // briefing filename
   char *hog;       // hog file name for this level
   char *score;     // music score of level
   char *progress;  // File name containing the progress background screen
 
-  //	level branching
+  // Level branching
   uint8_t lvlbranch0, lvlbranch1; // FORK or BRANCH command
   uint8_t secretlvl;              // SECRET command
   uint8_t pad;
@@ -251,10 +253,10 @@ struct tMission {
   //	listing of levels.
   int num_levels;     // number of levels
   int cur_level;      // current level playing.
-  tLevelNode *levels; // array of levels
+  std::vector<tLevelNode> levels; // array of levels
 };
 
-// structyre used to get information about a mission
+// structure used to get information about a mission
 struct tMissionInfo {
   char name[MSN_NAMELEN];
   char author[MSN_NAMELEN];
@@ -272,7 +274,19 @@ struct tMissionInfo {
 extern tMission Current_mission;
 extern tLevelNode *Current_level;
 
-extern char D3MissionsDir[];
+extern std::filesystem::path D3MissionsDir;
+
+/**
+ * Loads the mn3 file, specifies the hog and table file.
+ * @param mn3file file for loading
+ * @return true on success
+ */
+bool mn3_Open(const std::filesystem::path &mn3file);
+
+/**
+ * Closes the current mn3 file
+ */
+void mn3_Close();
 
 // Get the name field out of the mission file
 const char *GetMissionName(const char *mission);
@@ -308,13 +322,18 @@ bool LoadMissionLevel(int level);
 bool InitMissionScript();
 
 // Shows text on a background
-void ShowProgressScreen(const char *str, const char *str2 = NULL, bool flip = true);
+void ShowProgressScreen(const char *str, const char *str2 = nullptr, bool flip = true);
 
 // See if a mission file is multiplayer playable.
 bool IsMissionMultiPlayable(const char *mission);
 
-//	return information about a mission
-bool GetMissionInfo(const char *msnfile, tMissionInfo *msn);
+/**
+ * Fill information about a mission.
+ * @param msnfile mission file
+ * @param msn mission info to be filled
+ * @return true on success
+ */
+bool GetMissionInfo(const std::filesystem::path &msnfile, tMissionInfo *msn);
 
 // Returns the max number of teams this mission can support for this mod, or
 //-1 if this level shouldn't be played with this mission
diff --git a/Descent3/gamesequence.cpp b/Descent3/gamesequence.cpp
index fd8a26598..9a62f9478 100644
--- a/Descent3/gamesequence.cpp
+++ b/Descent3/gamesequence.cpp
@@ -1138,9 +1138,6 @@ extern matrix editor_player_orient;
 extern int editor_player_roomnum;
 #endif
 
-extern bool mn3_Open(const char *mn3file);
-extern void mn3_Close();
-
 extern bool Game_gauge_do_time_test;
 extern char Game_gauge_usefile[_MAX_PATH];
 
@@ -1331,8 +1328,6 @@ bool SimpleStartLevel(const std::filesystem::path& level_name) {
 
   Current_mission.cur_level = 1;
   Current_mission.num_levels = 1;
-  Current_mission.levels = mem_rmalloc<tLevelNode>();
-  memset(Current_mission.levels, 0, sizeof(tLevelNode));
 
   Current_level = nullptr;
   Current_mission.levels[0].filename = mem_strdup(level_name.u8string().c_str());
@@ -1455,7 +1450,7 @@ void DeleteAmbientObjects() {
 
 void Localization_SetLanguage(int type);
 int Localization_GetLanguage(void);
-void LoadLevelText(const char *level_filename);
+void LoadLevelText(const std::filesystem::path &level_filename);
 
 // Starts the level, which has already been loaded
 void StartLevel() {
diff --git a/Descent3/menu.cpp b/Descent3/menu.cpp
index 417cd3800..0f7e6c5a0 100644
--- a/Descent3/menu.cpp
+++ b/Descent3/menu.cpp
@@ -654,6 +654,9 @@
 
 #include <cstdio>
 #include <cstring>
+#include <filesystem>
+#include <sstream>
+#include <vector>
 
 #include "log.h"
 #include "menu.h"
@@ -661,7 +664,6 @@
 #include "game.h"
 #include "Mission.h"
 #include "multi_ui.h"
-#include "ctlconfig.h"
 #include "config.h"
 #include "gamesave.h"
 #include "gamesequence.h"
@@ -698,7 +700,8 @@ bool Directplay_lobby_launched_game = false;
 #define IDV_LOADLEVEL 20
 #define IDV_OK 1
 #define IDV_CANCEL 2
-bool MenuLoadLevel(void);
+
+bool MenuLoadLevel();
 #endif
 // for command line joining of games
 bool Auto_connected = false;
@@ -742,7 +745,7 @@ int MainMenu() {
   main_menu.AddItem(IDV_CREDITS, KEY_C, TXT_MENUCREDITS);
   main_menu.AddItem(IDV_QUIT, KEY_Q, TXT_MENUQUIT, MM_ENDMENU_TYPE);
 #ifdef _DEBUG
-  main_menu.AddItem(0, 0, NULL);
+  main_menu.AddItem(0, 0, nullptr);
   main_menu.AddItem(IDV_LOADLEVEL, 0, "Load Level");
 #endif
   //	page in ui data.
@@ -781,7 +784,7 @@ int MainMenu() {
       Demo_restart = false;
       SetGameMode(GM_NORMAL);
       SetFunctionMode(LOADDEMO_MODE);
-      exit_menu = 1;
+      exit_menu = true;
       continue;
     } else if (MultiDLLGameStarting) {
       // Go back into the multiplayer DLL @ the game list
@@ -789,32 +792,12 @@ int MainMenu() {
       LOG_DEBUG << "Returning to Multiplayer!";
 
       if (ReturnMultiplayerGameMenu()) {
-        exit_menu = 1;
+        exit_menu = true;
         SetFunctionMode(GAME_MODE);
         continue;
       }
     }
-    /*
-            else
-            {
-                    if(FirstGame)
-                    {
-                            //MenuScene();
-                            //ui_ShowCursor();
-                            //Descent->defer();
-                            //DoUIFrame();
-                            //rend_Flip();
-                            //GetUIFrameResult();
-                            res = IDV_NEWGAME;
-                    }
-                    else {
-                            main_menu.SetMusicRegion(MM_MUSIC_REGION);
-                            res = main_menu.DoUI();
-                    }
-            }
-            if (FirstGame)
-                    res = IDV_NEWGAME;
-    */
+
     res = FirstGame ? IDV_NEWGAME : -1;
     if (res == -1) {
       main_menu.SetMusicRegion(MM_MUSIC_REGION);
@@ -836,9 +819,9 @@ int MainMenu() {
       break;
     case IDV_QUIT:
       if (DoMessageBox(TXT_MENUQUIT, TXT_QUITMESSAGE, MSGBOX_YESNO)) {
-        exit_game = 1;
-        exit_menu = 1;
-        Mem_quick_exit = 1; // tell the mem library to not free up each chunk individually
+        exit_game = true;
+        exit_menu = true;
+        Mem_quick_exit = true; // tell the mem library to not free up each chunk individually
       }
       break;
     case IDV_LOADGAME:
@@ -864,12 +847,12 @@ int MainMenu() {
       LOG_DEBUG << "Multiplayer!";
       // make all ships available
       LOG_DEBUG << "Making all ships available";
-      for (int i = 0; i < MAX_SHIPS; i++) {
-        if (Ships[i].used)
-          PlayerSetShipPermission(-1, Ships[i].name, true);
+      for (auto & Ship : Ships) {
+        if (Ship.used)
+          PlayerSetShipPermission(-1, Ship.name, true);
       }
       if (MainMultiplayerMenu()) {
-        exit_menu = 1;
+        exit_menu = true;
         SetFunctionMode(GAME_MODE);
       }
     } break;
@@ -877,12 +860,12 @@ int MainMenu() {
       if (LoadDemoDialog()) {
         SetGameMode(GM_NORMAL);
         SetFunctionMode(LOADDEMO_MODE);
-        exit_menu = 1;
+        exit_menu = true;
       }
       break;
     case IDV_CREDITS:
       SetFunctionMode(CREDITS_MODE);
-      exit_menu = 1;
+      exit_menu = true;
       /*
       #if defined(DEMO)
               //extern void ShowStaticScreen(char *bitmap_filename);
@@ -901,7 +884,7 @@ int MainMenu() {
     case IDV_LOADLEVEL: {
       if (MenuLoadLevel()) {
         ShowProgressScreen(TXT_LOADINGLEVEL);
-        exit_menu = 1;
+        exit_menu = true;
       }
     } break;
 #endif
@@ -940,11 +923,10 @@ bool ProcessCommandLine() {
 #endif
     tokp = strtok(p, "/");
     if (stricmp(tokp, "ip") == 0) {
-      tokp = strtok(NULL, "/");
+      tokp = strtok(nullptr, "/");
       Auto_login_port[0] = '\0';
       strcpy(Auto_login_addr, tokp);
-      //			char seldll[_MAX_PATH*2];
-      // ddio_MakePath(seldll,Base_directory,"online","Direct TCP~IP Game.d3c",NULL);
+
       if (LoadMultiDLL("Direct TCP~IP")) {
         CallMultiDLL(MT_AUTO_LOGIN);
         if (MultiDLLGameStarting) {
@@ -957,11 +939,10 @@ bool ProcessCommandLine() {
         LOG_WARNING << "Couldn't load DLL.";
       }
     } else if (stricmp(tokp, "pxo") == 0) {
-      tokp = strtok(NULL, "/");
+      tokp = strtok(nullptr, "/");
       Auto_login_port[0] = '\0';
       strcpy(Auto_login_addr, tokp);
-      //		char seldll[_MAX_PATH*2];
-      // ddio_MakePath(seldll,Base_directory,"online","parallax online.d3c",NULL);
+
       if (LoadMultiDLL("parallax online")) {
         CallMultiDLL(MT_AUTO_LOGIN);
         if (MultiDLLGameStarting) {
@@ -1042,6 +1023,7 @@ bool ProcessCommandLine() {
   SetUICallback(DEFAULT_UICALLBACK);
   return exit_menu ? true : false;
 }
+
 //////////////////////////////////////////////////////////////////////////////
 //	Start New Game
 #define MSNDLG_WIDTH 512
@@ -1057,6 +1039,7 @@ bool ProcessCommandLine() {
 #define MSNBTN_X2 ((3 * MSNDLG_WIDTH / 4) - (MSNBTN_W / 2))
 #define MSNBTN_Y (MSNDLG_HEIGHT - 64)
 #define UID_MSNLB 100
+#define UID_LVLB 101
 #define UID_MSNINFO 0x1000
 #define TRAINING_MISSION_NAME "Pilot Training"
 
@@ -1090,25 +1073,23 @@ static inline int count_missions(const std::vector<std::filesystem::path> &missi
   return c;
 }
 
-static inline int generate_mission_listbox(newuiListBox *lb, int n_maxfiles, char **filelist,
+static inline int generate_mission_listbox(newuiListBox *lb, std::vector<std::filesystem::path> &filelist,
                                            const std::vector<std::filesystem::path> &missions_directories) {
   int c = 0;
   for (const auto &missions_directory : missions_directories) {
     ddio_DoForeachFile(
-        missions_directory, std::regex(".*\\.mn3"), [&c, &lb, &n_maxfiles, &filelist](const std::filesystem::path &path) {
+        missions_directory, std::regex(".*\\.mn3"), [&c, &lb, &filelist](const std::filesystem::path &path) {
           tMissionInfo msninfo{};
-          if (c < n_maxfiles) {
-            if (stricmp(path.filename().u8string().c_str(), "d3_2.mn3") == 0)
-              return;
-            if (GetMissionInfo(path.filename().u8string().c_str(), &msninfo) && msninfo.name[0] && msninfo.single) {
-              filelist[c] = mem_strdup(path.filename().u8string().c_str());
-              lb->AddItem(msninfo.name);
-              c++;
-              if (!(c % 2))
-                DoWaitMessage(true);
-            }
-          }
-        });
+          if (stricmp(path.filename().u8string().c_str(), "d3_2.mn3") == 0)
+          return;
+        if (GetMissionInfo(path.filename(), &msninfo) && msninfo.name[0] && msninfo.single) {
+          filelist.push_back(path.filename());
+          lb->AddItem(msninfo.name);
+          c++;
+          if (!(c % 2))
+            DoWaitMessage(true);
+        }
+      });
   }
 
   return c;
@@ -1121,8 +1102,8 @@ bool MenuNewGame() {
   newuiTiledWindow menu;
   newuiSheet *select_sheet;
   newuiListBox *msn_lb;
-  char **filelist = nullptr;
-  int n_missions, i, res;
+  std::vector<std::filesystem::path> filelist;
+  int n_missions, res;
   bool found = false;
   bool do_menu = true, load_mission = false, retval = true;
 #ifdef DEMO
@@ -1174,59 +1155,41 @@ bool MenuNewGame() {
   menu.Create(TXT_MENUNEWGAME, 0, 0, 448, 384);
 
   select_sheet = menu.GetSheet();
-  select_sheet->NewGroup(NULL, 10, 0);
+  select_sheet->NewGroup(nullptr, 10, 0);
   msn_lb = select_sheet->AddListBox(352, 256, UID_MSNLB);
-  select_sheet->NewGroup(NULL, 160, 280, NEWUI_ALIGN_HORIZ);
+  select_sheet->NewGroup(nullptr, 160, 280, NEWUI_ALIGN_HORIZ);
   select_sheet->AddButton(TXT_OK, UID_OK);
   select_sheet->AddButton(TXT_CANCEL, UID_CANCEL);
 #ifndef OEM
   select_sheet->AddButton(TXT_MSNINFO, UID_MSNINFO);
 #endif
 #ifndef OEM
-  // add mission names to listbox
-  // count valid mission files.
-  // add a please wait dialog here.
-  auto missions_directories = cf_LocateMultiplePaths("missions");
-  n_missions = 0;
-  n_missions += count_missions(missions_directories);
-  if (n_missions) {
-    // allocate extra mission slot because of check below which adds a name to the filelist.
-    filelist = (char **)mem_malloc(sizeof(char *) * (n_missions + 1));
-    for (i = 0; i < (n_missions + 1); i++)
-      filelist[i] = NULL;
-  } else {
+  // generate real listbox now.
+  n_missions = generate_mission_listbox(msn_lb, filelist, cf_LocateMultiplePaths("missions"));
+
+  if (n_missions == 0) {
     DoMessageBox(TXT_ERROR, TXT_NOMISSIONS, MSGBOX_OK);
-    retval = false;
     DoWaitMessage(false);
-    goto missions_fail;
+    return false;
   }
-  // generate real listbox now.
-  generate_mission_listbox(msn_lb, n_missions, filelist, missions_directories);
-  // #ifdef RELEASE
-  int k;
-  for (k = 0; k < n_missions; k++) {
-    if (!filelist[k])
-      continue;
-    if (stricmp(filelist[k], "d3.mn3") == 0) {
+  for (auto const &mission : filelist) {
+    if (stricmp(mission.u8string().c_str(), "d3.mn3") == 0) {
       found = true;
       break;
     }
   }
   if (!found) {
-    filelist[n_missions] = mem_strdup("d3.mn3");
+    filelist.emplace_back("d3.mn3");
     msn_lb->AddItem(TXT_MAINMISSION);
     n_missions++;
   }
-// #endif
 #else
 #define OEM_MISSION_NAME "Descent 3: Sol Ascent"
-#define OEM_TRAINING_NAME "Pilot Training "
+#define OEM_TRAINING_NAME "Pilot Training"
   n_missions = 2;
-  filelist = mem_rmalloc<char *>(2);
-  filelist[0] = mem_strdup(OEM_MISSION_FILE);
-  ;
+  filelist.emplace_back(OEM_MISSION_NAME);
   msn_lb->AddItem(OEM_MISSION_NAME);
-  filelist[1] = mem_strdup(OEM_TRAINING_FILE);
+  filelist.emplace_back(OEM_TRAINING_NAME);
   msn_lb->AddItem(OEM_TRAINING_NAME);
 #endif
   DoWaitMessage(false);
@@ -1238,14 +1201,14 @@ bool MenuNewGame() {
     res = menu.DoUI();
 #ifndef OEM
     if (res == UID_MSNINFO) {
-      tMissionInfo msninfo;
+      tMissionInfo msninfo{};
       int index = msn_lb->GetCurrentIndex();
       if (index >= 0 && index < n_missions) {
         if (GetMissionInfo(filelist[index], &msninfo)) {
           if (msninfo.name[0]) {
             newuiTiledWindow infownd;
             newuiSheet *sheet;
-            infownd.Create(NULL, 0, 0, 384, 192);
+            infownd.Create(nullptr, 0, 0, 384, 192);
             infownd.Open();
             sheet = infownd.GetSheet();
             sheet->NewGroup(TXT_MSNNAME, 0, 0);
@@ -1260,7 +1223,7 @@ bool MenuNewGame() {
               sheet->AddText(msninfo.desc);
             else
               sheet->AddText(TXT_NONE);
-            sheet->NewGroup(NULL, 240, 118);
+            sheet->NewGroup(nullptr, 240, 118);
             sheet->AddButton(TXT_OK, UID_OK);
             infownd.DoUI();
             infownd.Close();
@@ -1277,15 +1240,11 @@ bool MenuNewGame() {
     retval = false;
   } else if (res == UID_OK || res == UID_MSNLB) {
     int index = msn_lb->GetCurrentIndex();
-    char *nameptr = NULL;
-    if (index >= 0 && index < n_missions) {
+    std::filesystem::path nameptr;
+    if (index >= 0 && index < filelist.size()) {
       nameptr = filelist[index];
     }
-#ifndef OEM
-    if (!nameptr || !LoadMission(nameptr)) {
-#else
-    if (!LoadMission(nameptr)) {
-#endif
+    if (nameptr.empty() || !LoadMission(nameptr.u8string().c_str())) {
       DoMessageBox(TXT_ERROR, TXT_ERRLOADMSN, MSGBOX_OK);
       retval = false;
     } else {
@@ -1300,8 +1259,7 @@ bool MenuNewGame() {
       highest = std::min(highest + 1, Current_mission.num_levels);
 #endif
       if (highest > 1) {
-        int start_level;
-        start_level = DisplayLevelWarpDlg(highest);
+        int start_level = DisplayLevelWarpDlg(highest);
         if (start_level == -1) {
           goto redo_newgame_menu;
         } else {
@@ -1317,63 +1275,87 @@ bool MenuNewGame() {
     }
   }
   menu.Destroy();
-missions_fail:
-  // free all memory
-  for (i = 0; i < n_missions; i++) {
-    if (filelist[i]) {
-      mem_free(filelist[i]);
-    }
-  }
-  if (filelist) {
-    mem_free(filelist);
-  }
+
   return retval;
 #endif
 }
+
 // DisplayLevelWarpDlg
 //	pass in the max level allowed to be chosen, if -1, than all levels are allowed (a.k.a level warp cheat)
 int DisplayLevelWarpDlg(int max_level) {
-  newuiMessageBox hwnd;
-  newuiSheet *sheet;
+  newuiTiledWindow menu;
+  newuiSheet *select_sheet;
+  newuiListBox *level_listbox;
+
   int chosen_level = 1, res;
   int highest_allowed;
-  char buffer[128];
-  char *input_text;
-  // creates a sheet
-  sheet = hwnd.GetSheet();
+
+  // Create UI
+  menu.Create(Current_mission.name, 0, 0, 448, 384);
+  select_sheet = menu.GetSheet();
+  select_sheet->NewGroup(nullptr, 10, 0);
+  level_listbox = select_sheet->AddListBox(352, 256, UID_LVLB, UILB_NOSORT);
+  select_sheet->NewGroup(nullptr, 160, 280, NEWUI_ALIGN_HORIZ);
+  select_sheet->AddButton(TXT_OK, UID_OK);
+  select_sheet->AddButton(TXT_CANCEL, UID_CANCEL);
+
   if (max_level != -1) {
-    hwnd.Create(TXT_LEVELSELECT, MSGBOX_OKCANCEL);
     highest_allowed = max_level;
-    snprintf(buffer, sizeof(buffer), TXT_LEVELSELECTB, highest_allowed);
   } else {
     // level warp
-    hwnd.Create(TXT_LEVELWARP, MSGBOX_OKCANCEL);
     highest_allowed = Current_mission.num_levels;
-    snprintf(buffer, sizeof(buffer), TXT_LEVELWARPB, Current_mission.num_levels);
   }
-  sheet->NewGroup(buffer, 0, 0);
-  input_text = sheet->AddEditBox(NULL, 4, 64, IDV_QUIT, UIED_NUMBERS);
-  sprintf(input_text, "%d", chosen_level);
-redo_level_choose:
-  hwnd.Open();
-  res = hwnd.DoUI();
-  hwnd.Close();
-  if (res == UID_OK || res == IDV_QUIT) {
-    chosen_level = atoi(input_text);
-    if (chosen_level < 1 || chosen_level > highest_allowed) {
-      snprintf(buffer, sizeof(buffer), TXT_CHOOSELEVEL, highest_allowed);
-      DoMessageBox(TXT_ERROR, buffer, MSGBOX_OK);
-      goto redo_level_choose;
-    }
-  } else {
-    chosen_level = -1;
+
+  int mn3_handle = -1;
+
+  // Because of D3: Retribution split mission nature we have to load library early
+  if (stricmp(Current_mission.filename, "d3.mn3") == 0) {
+    mn3_handle = cf_OpenLibrary(std::filesystem::path("missions") / "d3_2.mn3");
+  }
+  if (stricmp(Current_mission.filename, "d3_2.mn3") == 0) {
+    mn3_handle = cf_OpenLibrary(std::filesystem::path("missions") / "d3.mn3");
+  }
+
+  for (int i = 0; i < highest_allowed; i++) {
+    std::stringstream ss;
+    level_info info{};
+
+    LoadLevelInfo(Current_mission.levels[i].filename, info);
+    ss << std::setw(2) << std::setfill('0') << i + 1 << ". " << info.name;
+    level_listbox->AddItem(ss.str().c_str());
+  }
+
+  if (mn3_handle != -1) {
+    cf_CloseLibrary(mn3_handle);
   }
-  hwnd.Destroy();
+
+  // Main UI loop
+  menu.Open();
+  do {
+    res = menu.DoUI();
+    if (res == UID_OK || res == UID_LVLB) {
+      int index = level_listbox->GetCurrentIndex();
+      chosen_level = index + 1; // Levels are 1-based
+      if (chosen_level < 1 || chosen_level > highest_allowed) {
+        DoMessageBox(TXT_ERROR, TXT_CHOOSELEVEL, MSGBOX_OK);
+        continue; // Allow another selection
+      }
+      if (res == UID_LVLB) {
+        res = UID_OK;
+      }
+    } else if (res == UID_CANCEL) {
+      chosen_level = -1;
+    }
+  } while (res != UID_OK && res != UID_CANCEL);
+
+  menu.Close();
+  menu.Destroy();
   return chosen_level;
 }
+
 #ifdef _DEBUG
 // Loads a level and starts the game
-bool MenuLoadLevel(void) {
+bool MenuLoadLevel() {
   std::filesystem::path buffer;
   if (DoPathFileDialog(false, buffer, "Load Level", {"*.d3l"}, PFDF_FILEMUSTEXIST)) {
     SimpleStartLevel(buffer);
diff --git a/Descent3/menu.h b/Descent3/menu.h
index 29e378753..0692f9ca4 100644
--- a/Descent3/menu.h
+++ b/Descent3/menu.h
@@ -55,7 +55,8 @@
 #ifndef MENU_H
 #define MENU_H
 
-#include "pstypes.h"
+#include <cstdint>
+
 #include "grdefs.h"
 
 #define MAX_MENUS 5
diff --git a/Descent3/mission_download.cpp b/Descent3/mission_download.cpp
index 3b5293932..bdfd594dd 100644
--- a/Descent3/mission_download.cpp
+++ b/Descent3/mission_download.cpp
@@ -602,8 +602,8 @@ int msn_CheckGetMission(network_address *net_addr, char *filename) {
   return 1;
 #else
   // Don't download local missions
-  char pathname[_MAX_PATH];
-  ddio_MakePath(pathname, D3MissionsDir, filename, NULL);
+  std::filesystem::path pathname;
+  pathname = D3MissionsDir / filename;
   if (cfexist(filename) || cfexist(pathname)) {
     return 1;
   }
diff --git a/Descent3/multi_server.cpp b/Descent3/multi_server.cpp
index ddbabf158..7235e15d7 100644
--- a/Descent3/multi_server.cpp
+++ b/Descent3/multi_server.cpp
@@ -826,7 +826,7 @@ void MultiStartServer(int playing, char *scriptname, int dedicated_server_num_te
 //-1 Not compatible!
 //>=0 Number of teams supported for this mod & level
 
-#define SCRIPTBADFORMISSION -1
+#define SCRIPTBADFORMISSION (-1)
 
 int CheckMissionForScript(char *mission, char *script, int dedicated_server_num_teams) {
   char mod_keys[MAX_KEYWORDLEN];
diff --git a/lib/manage.h b/lib/manage.h
index 6bb4beda0..3659e8b3b 100644
--- a/lib/manage.h
+++ b/lib/manage.h
@@ -89,7 +89,7 @@ void mng_ClearAddonTables();
 
 // Push the given table file as an addon table file
 // returns true on success
-bool mng_SetAddonTable(char *name);
+bool mng_SetAddonTable(const char *name);
 
 // Pushes an addon pack onto the stack so we can keep track of it
 void mng_PushAddonPage(int pagetype, char *name, int overlay);
diff --git a/manage/manage.cpp b/manage/manage.cpp
index b5429d334..97736b03d 100644
--- a/manage/manage.cpp
+++ b/manage/manage.cpp
@@ -2729,7 +2729,7 @@ void mng_ClearAddonTables() {
 }
 // Push the given table file as an addon table file
 // returns true on success
-bool mng_SetAddonTable(char *name) {
+bool mng_SetAddonTable(const char *name) {
   ASSERT(Num_addon_tables < MAX_ADDON_TABLES);
   if (Num_addon_tables >= MAX_ADDON_TABLES)
     return false;
diff --git a/netgames/dmfc/dmfcfunctions.cpp b/netgames/dmfc/dmfcfunctions.cpp
index b9abbb0f1..6489f5f29 100644
--- a/netgames/dmfc/dmfcfunctions.cpp
+++ b/netgames/dmfc/dmfcfunctions.cpp
@@ -325,7 +325,7 @@ void (*DLLCheckBoxSetCheck)(void *cb, bool state);
 bool (*DLLCheckBoxIsChecked)(void *cb);
 uint32_t (*DLLnw_GetHostAddressFromNumbers)(char *str);
 void (*TableFilesClear)(void);
-bool (*TableFileAdd)(char *filename);
+bool (*TableFileAdd)(const char *filename);
 void (*DLLDebugBreak_callback_stop)(void);
 void (*DLLDebugBreak_callback_resume)(void);
 void (*DLLInt3MessageBox)(const char *file, const char *line);
diff --git a/netgames/includes/gamedll_header.h b/netgames/includes/gamedll_header.h
index 29c032f2c..d04a4c7f5 100644
--- a/netgames/includes/gamedll_header.h
+++ b/netgames/includes/gamedll_header.h
@@ -928,7 +928,7 @@ typedef void (*TableFilesClear_fp)(void);
 DMFCDLLOUT(TableFilesClear_fp TableFilesClear;)
 
 //	Adds a table file into the manage system for add-on data
-typedef bool (*TableFileAdd_fp)(char *filename);
+typedef bool (*TableFileAdd_fp)(const char *filename);
 DMFCDLLOUT(TableFileAdd_fp TableFileAdd;)
 
 // Debugger interaction