diff --git a/src/odr/file.cpp b/src/odr/file.cpp
index 565fe8a5..52e8d6e9 100644
--- a/src/odr/file.cpp
+++ b/src/odr/file.cpp
@@ -98,6 +98,10 @@ FileCategory DecodedFile::file_category() const noexcept {
 
 FileMeta DecodedFile::file_meta() const noexcept { return m_impl->file_meta(); }
 
+DecoderEngine DecodedFile::decoder_engine() const noexcept {
+  return m_impl->decoder_engine();
+}
+
 File DecodedFile::file() const { return File(m_impl->file()); }
 
 bool DecodedFile::is_text_file() const {
diff --git a/src/odr/file.hpp b/src/odr/file.hpp
index 1070340f..0b9f4823 100644
--- a/src/odr/file.hpp
+++ b/src/odr/file.hpp
@@ -190,6 +190,7 @@ class DecodedFile {
   [[nodiscard]] FileType file_type() const noexcept;
   [[nodiscard]] FileCategory file_category() const noexcept;
   [[nodiscard]] FileMeta file_meta() const noexcept;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept;
 
   [[nodiscard]] File file() const;
 
diff --git a/src/odr/internal/abstract/file.hpp b/src/odr/internal/abstract/file.hpp
index cd86ed54..63cbbaa9 100644
--- a/src/odr/internal/abstract/file.hpp
+++ b/src/odr/internal/abstract/file.hpp
@@ -38,6 +38,7 @@ class DecodedFile {
   [[nodiscard]] virtual FileType file_type() const noexcept = 0;
   [[nodiscard]] virtual FileCategory file_category() const noexcept = 0;
   [[nodiscard]] virtual FileMeta file_meta() const noexcept = 0;
+  [[nodiscard]] virtual DecoderEngine decoder_engine() const noexcept = 0;
 };
 
 class TextFile : public DecodedFile {
diff --git a/src/odr/internal/cfb/cfb_file.cpp b/src/odr/internal/cfb/cfb_file.cpp
index 7facfc25..e1e818a2 100644
--- a/src/odr/internal/cfb/cfb_file.cpp
+++ b/src/odr/internal/cfb/cfb_file.cpp
@@ -22,6 +22,10 @@ FileMeta CfbFile::file_meta() const noexcept {
   return meta;
 }
 
+DecoderEngine CfbFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 std::shared_ptr<abstract::Archive> CfbFile::archive() const {
   return std::make_shared<CfbArchive>(m_cfb);
 }
diff --git a/src/odr/internal/cfb/cfb_file.hpp b/src/odr/internal/cfb/cfb_file.hpp
index 35a7ac12..f5696f0e 100644
--- a/src/odr/internal/cfb/cfb_file.hpp
+++ b/src/odr/internal/cfb/cfb_file.hpp
@@ -26,6 +26,7 @@ class CfbFile final : public abstract::ArchiveFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
   [[nodiscard]] std::shared_ptr<abstract::Archive> archive() const final;
 
diff --git a/src/odr/internal/common/image_file.cpp b/src/odr/internal/common/image_file.cpp
index 2f655e9e..43f14acf 100644
--- a/src/odr/internal/common/image_file.cpp
+++ b/src/odr/internal/common/image_file.cpp
@@ -14,6 +14,10 @@ FileType ImageFile::file_type() const noexcept { return m_file_type; }
 
 FileMeta ImageFile::file_meta() const noexcept { return {}; }
 
+DecoderEngine ImageFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 std::shared_ptr<abstract::Image> ImageFile::image() const { return {}; }
 
 } // namespace odr::internal::common
diff --git a/src/odr/internal/common/image_file.hpp b/src/odr/internal/common/image_file.hpp
index da61e735..81024754 100644
--- a/src/odr/internal/common/image_file.hpp
+++ b/src/odr/internal/common/image_file.hpp
@@ -13,6 +13,7 @@ class ImageFile : public abstract::ImageFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
   [[nodiscard]] std::shared_ptr<abstract::Image> image() const final;
 
diff --git a/src/odr/internal/csv/csv_file.cpp b/src/odr/internal/csv/csv_file.cpp
index 59936046..0beaa2f1 100644
--- a/src/odr/internal/csv/csv_file.cpp
+++ b/src/odr/internal/csv/csv_file.cpp
@@ -24,4 +24,8 @@ FileMeta CsvFile::file_meta() const noexcept {
   return {FileType::comma_separated_values, false, {}};
 }
 
+DecoderEngine CsvFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 } // namespace odr::internal::csv
diff --git a/src/odr/internal/csv/csv_file.hpp b/src/odr/internal/csv/csv_file.hpp
index b0fadebf..00d67dd4 100644
--- a/src/odr/internal/csv/csv_file.hpp
+++ b/src/odr/internal/csv/csv_file.hpp
@@ -17,6 +17,7 @@ class CsvFile final : public abstract::TextFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
 private:
   std::shared_ptr<text::TextFile> m_file;
diff --git a/src/odr/internal/json/json_file.cpp b/src/odr/internal/json/json_file.cpp
index f19ffca1..71b35024 100644
--- a/src/odr/internal/json/json_file.cpp
+++ b/src/odr/internal/json/json_file.cpp
@@ -24,4 +24,8 @@ FileMeta JsonFile::file_meta() const noexcept {
   return {FileType::javascript_object_notation, false, {}};
 }
 
+DecoderEngine JsonFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 } // namespace odr::internal::json
diff --git a/src/odr/internal/json/json_file.hpp b/src/odr/internal/json/json_file.hpp
index 29872e23..6640d2bc 100644
--- a/src/odr/internal/json/json_file.hpp
+++ b/src/odr/internal/json/json_file.hpp
@@ -17,6 +17,7 @@ class JsonFile final : public abstract::TextFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
 private:
   std::shared_ptr<text::TextFile> m_file;
diff --git a/src/odr/internal/odf/odf_file.cpp b/src/odr/internal/odf/odf_file.cpp
index 12cf46f9..5e85d90a 100644
--- a/src/odr/internal/odf/odf_file.cpp
+++ b/src/odr/internal/odf/odf_file.cpp
@@ -43,6 +43,10 @@ FileType OpenDocumentFile::file_type() const noexcept {
 
 FileMeta OpenDocumentFile::file_meta() const noexcept { return m_file_meta; }
 
+DecoderEngine OpenDocumentFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 DocumentType OpenDocumentFile::document_type() const {
   return m_file_meta.document_meta->document_type;
 }
diff --git a/src/odr/internal/odf/odf_file.hpp b/src/odr/internal/odf/odf_file.hpp
index 684ac403..8d50525e 100644
--- a/src/odr/internal/odf/odf_file.hpp
+++ b/src/odr/internal/odf/odf_file.hpp
@@ -28,6 +28,8 @@ class OpenDocumentFile final : public virtual abstract::DocumentFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
+
   [[nodiscard]] DocumentType document_type() const final;
   [[nodiscard]] DocumentMeta document_meta() const final;
 
diff --git a/src/odr/internal/oldms/oldms_file.cpp b/src/odr/internal/oldms/oldms_file.cpp
index 9b5a9f0f..256912be 100644
--- a/src/odr/internal/oldms/oldms_file.cpp
+++ b/src/odr/internal/oldms/oldms_file.cpp
@@ -62,6 +62,10 @@ FileType LegacyMicrosoftFile::file_type() const noexcept {
 
 FileMeta LegacyMicrosoftFile::file_meta() const noexcept { return m_file_meta; }
 
+DecoderEngine LegacyMicrosoftFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 DocumentType LegacyMicrosoftFile::document_type() const {
   return m_file_meta.document_meta->document_type;
 }
diff --git a/src/odr/internal/oldms/oldms_file.hpp b/src/odr/internal/oldms/oldms_file.hpp
index f3651c7e..7950b3e3 100644
--- a/src/odr/internal/oldms/oldms_file.hpp
+++ b/src/odr/internal/oldms/oldms_file.hpp
@@ -25,6 +25,8 @@ class LegacyMicrosoftFile final : public abstract::DocumentFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
+
   [[nodiscard]] DocumentType document_type() const final;
   [[nodiscard]] DocumentMeta document_meta() const final;
 
diff --git a/src/odr/internal/ooxml/ooxml_file.cpp b/src/odr/internal/ooxml/ooxml_file.cpp
index 2cf85092..6a1404be 100644
--- a/src/odr/internal/ooxml/ooxml_file.cpp
+++ b/src/odr/internal/ooxml/ooxml_file.cpp
@@ -37,6 +37,10 @@ FileType OfficeOpenXmlFile::file_type() const noexcept {
 
 FileMeta OfficeOpenXmlFile::file_meta() const noexcept { return m_file_meta; }
 
+DecoderEngine OfficeOpenXmlFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 DocumentType OfficeOpenXmlFile::document_type() const {
   return m_file_meta.document_meta->document_type;
 }
diff --git a/src/odr/internal/ooxml/ooxml_file.hpp b/src/odr/internal/ooxml/ooxml_file.hpp
index b3ab97a1..e6b420fe 100644
--- a/src/odr/internal/ooxml/ooxml_file.hpp
+++ b/src/odr/internal/ooxml/ooxml_file.hpp
@@ -27,6 +27,8 @@ class OfficeOpenXmlFile final : public abstract::DocumentFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
+
   [[nodiscard]] DocumentType document_type() const final;
   [[nodiscard]] DocumentMeta document_meta() const final;
 
diff --git a/src/odr/internal/open_strategy.cpp b/src/odr/internal/open_strategy.cpp
index 37df3282..fe20de88 100644
--- a/src/odr/internal/open_strategy.cpp
+++ b/src/odr/internal/open_strategy.cpp
@@ -22,7 +22,7 @@
 namespace odr::internal {
 
 std::vector<FileType>
-open_strategy::types(std::shared_ptr<abstract::File> file) {
+open_strategy::types(const std::shared_ptr<abstract::File> &file) {
   std::vector<FileType> result;
 
   auto file_type = magic::file_type(*file);
diff --git a/src/odr/internal/open_strategy.hpp b/src/odr/internal/open_strategy.hpp
index a18cef8a..b6c554db 100644
--- a/src/odr/internal/open_strategy.hpp
+++ b/src/odr/internal/open_strategy.hpp
@@ -21,9 +21,10 @@ class Path;
 } // namespace odr::internal::common
 
 namespace odr::internal::open_strategy {
-std::vector<FileType> types(std::shared_ptr<internal::abstract::File> file);
+std::vector<FileType>
+types(const std::shared_ptr<internal::abstract::File> &file);
 std::vector<DecoderEngine>
-engines(std::shared_ptr<internal::abstract::File> file, FileType as);
+engines(const std::shared_ptr<internal::abstract::File> &file, FileType as);
 
 std::unique_ptr<internal::abstract::DecodedFile>
 open_file(std::shared_ptr<internal::abstract::File> file);
diff --git a/src/odr/internal/pdf/pdf_file.cpp b/src/odr/internal/pdf/pdf_file.cpp
index 00260c0f..4227e13e 100644
--- a/src/odr/internal/pdf/pdf_file.cpp
+++ b/src/odr/internal/pdf/pdf_file.cpp
@@ -19,4 +19,8 @@ FileType PdfFile::file_type() const noexcept {
 
 FileMeta PdfFile::file_meta() const noexcept { return {}; }
 
+DecoderEngine PdfFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 } // namespace odr::internal::pdf
diff --git a/src/odr/internal/pdf/pdf_file.hpp b/src/odr/internal/pdf/pdf_file.hpp
index 42b751be..8b72bd37 100644
--- a/src/odr/internal/pdf/pdf_file.hpp
+++ b/src/odr/internal/pdf/pdf_file.hpp
@@ -14,6 +14,7 @@ class PdfFile : public abstract::DecodedFile {
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileCategory file_category() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
 private:
   std::shared_ptr<abstract::File> m_file;
diff --git a/src/odr/internal/svm/svm_file.cpp b/src/odr/internal/svm/svm_file.cpp
index fefc604f..47db2716 100644
--- a/src/odr/internal/svm/svm_file.cpp
+++ b/src/odr/internal/svm/svm_file.cpp
@@ -31,6 +31,10 @@ FileMeta SvmFile::file_meta() const noexcept {
   return result;
 }
 
+DecoderEngine SvmFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 std::shared_ptr<abstract::Image> SvmFile::image() const { return {}; }
 
 } // namespace odr::internal::svm
diff --git a/src/odr/internal/svm/svm_file.hpp b/src/odr/internal/svm/svm_file.hpp
index 60e1f806..dd28cd6d 100644
--- a/src/odr/internal/svm/svm_file.hpp
+++ b/src/odr/internal/svm/svm_file.hpp
@@ -20,6 +20,7 @@ class SvmFile final : public abstract::ImageFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
   [[nodiscard]] std::shared_ptr<abstract::Image> image() const final;
 
diff --git a/src/odr/internal/text/text_file.cpp b/src/odr/internal/text/text_file.cpp
index a6908f5d..7fc489c1 100644
--- a/src/odr/internal/text/text_file.cpp
+++ b/src/odr/internal/text/text_file.cpp
@@ -22,4 +22,8 @@ FileMeta TextFile::file_meta() const noexcept {
   return {FileType::text_file, false, {}};
 }
 
+DecoderEngine TextFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 } // namespace odr::internal::text
diff --git a/src/odr/internal/text/text_file.hpp b/src/odr/internal/text/text_file.hpp
index f0e84271..69bad36b 100644
--- a/src/odr/internal/text/text_file.hpp
+++ b/src/odr/internal/text/text_file.hpp
@@ -18,6 +18,7 @@ class TextFile final : public abstract::TextFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
 private:
   std::shared_ptr<abstract::File> m_file;
diff --git a/src/odr/internal/zip/zip_file.cpp b/src/odr/internal/zip/zip_file.cpp
index b0fb59a7..496a986a 100644
--- a/src/odr/internal/zip/zip_file.cpp
+++ b/src/odr/internal/zip/zip_file.cpp
@@ -23,6 +23,10 @@ FileMeta ZipFile::file_meta() const noexcept {
   return meta;
 }
 
+DecoderEngine ZipFile::decoder_engine() const noexcept {
+  return DecoderEngine::odr;
+}
+
 std::shared_ptr<abstract::Archive> ZipFile::archive() const {
   return std::make_shared<ZipArchive>(m_zip);
 }
diff --git a/src/odr/internal/zip/zip_file.hpp b/src/odr/internal/zip/zip_file.hpp
index 6d11c195..fde6f6db 100644
--- a/src/odr/internal/zip/zip_file.hpp
+++ b/src/odr/internal/zip/zip_file.hpp
@@ -27,6 +27,7 @@ class ZipFile final : public abstract::ArchiveFile {
 
   [[nodiscard]] FileType file_type() const noexcept final;
   [[nodiscard]] FileMeta file_meta() const noexcept final;
+  [[nodiscard]] DecoderEngine decoder_engine() const noexcept final;
 
   [[nodiscard]] std::shared_ptr<abstract::Archive> archive() const final;