Add project files.

Directory.Build.props

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+<Project>
+  <PropertyGroup>
+    <Nullable>enable</Nullable>
+    <AvaloniaVersion>11.0.2</AvaloniaVersion>
+  </PropertyGroup>
+</Project>

tex2mathml.Desktop/Program.cs

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+using System;
+
+using Avalonia;
+using Avalonia.ReactiveUI;
+
+namespace tex2mathml.Desktop;
+
+class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace()
+            .UseReactiveUI();
+}

tex2mathml.Desktop/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embeded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="AvaloniaTest.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

tex2mathml.Desktop/tex2mathml.Desktop.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <!--If you are willing to use Windows/MacOS native APIs you will need to create 3 projects.
+    One for Windows with net7.0-windows TFM, one for MacOS with net7.0-macos and one with net7.0 TFM for Linux.-->
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia.Desktop" Version="$(AvaloniaVersion)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\tex2mathml\tex2mathml.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="assets\texmath.exe">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+</Project>

tex2mathml.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "tex2mathml", "tex2mathml\tex2mathml.csproj", "{01E4DFBE-2C43-45B3-B52B-1378C517CE97}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "tex2mathml.Desktop", "tex2mathml.Desktop\tex2mathml.Desktop.csproj", "{85DB25CA-79D3-44D9-AB25-A85053A05DFE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{01E4DFBE-2C43-45B3-B52B-1378C517CE97}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{01E4DFBE-2C43-45B3-B52B-1378C517CE97}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{01E4DFBE-2C43-45B3-B52B-1378C517CE97}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{01E4DFBE-2C43-45B3-B52B-1378C517CE97}.Release|Any CPU.Build.0 = Release|Any CPU
+		{85DB25CA-79D3-44D9-AB25-A85053A05DFE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{85DB25CA-79D3-44D9-AB25-A85053A05DFE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{85DB25CA-79D3-44D9-AB25-A85053A05DFE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{85DB25CA-79D3-44D9-AB25-A85053A05DFE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C355459D-834D-4C80-AD84-C5C181FE4CF7}
+	EndGlobalSection
+EndGlobal

tex2mathml/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="tex2mathml.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

tex2mathml/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+using tex2mathml.ViewModels;
+using tex2mathml.Views;
+
+namespace tex2mathml;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainViewModel()
+            };
+        }
+        else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
+        {
+            singleViewPlatform.MainView = new MainView
+            {
+                DataContext = new MainViewModel()
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

tex2mathml/ViewModels/MainViewModel.cs

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+namespace tex2mathml.ViewModels;
+
+public class MainViewModel : ViewModelBase
+{
+    public string Greeting => "Welcome to Avalonia!";
+}

tex2mathml/ViewModels/ViewModelBase.cs

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+using ReactiveUI;
+
+namespace tex2mathml.ViewModels;
+
+public class ViewModelBase : ReactiveObject
+{
+}

tex2mathml/Views/MainView.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="clr-namespace:tex2mathml.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="tex2mathml.Views.MainView"
+             x:DataType="vm:MainViewModel">
+  <Design.DataContext>
+    <!-- This only sets the DataContext for the previewer in an IDE,
+         to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+    <vm:MainViewModel />
+  </Design.DataContext>
+
+  <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+</UserControl>

tex2mathml/Views/MainView.axaml.cs

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+using Avalonia.Controls;
+
+namespace tex2mathml.Views;
+
+public partial class MainView : UserControl
+{
+    public MainView()
+    {
+        InitializeComponent();
+    }
+}

tex2mathml/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+		xmlns:math="clr-namespace:AvaloniaMath.Controls;assembly=AvaloniaMath"
+        xmlns:vm="using:tex2mathml.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:tex2mathml.Views"
+        mc:Ignorable="d" d:DesignWidth="500" d:DesignHeight="230"
+        x:Class="tex2mathml.Views.MainWindow"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="tex2mathml">
+	<Grid RowDefinitions="auto,auto,auto,auto,auto">
+
+		<TextBox Name="formula" Text="L = \int_a^b \sqrt[4]{ \left| \sum_{i,j=1}^ng_{ij}\left(\gamma(t)\right) \left[\frac{d}{dt}x^i\circ\gamma(t) \right] \left\{ \frac{d}{dt}x^j\circ\gamma(t) \right\} \right|}dt"/>
+		<Slider Grid.Row="1" Minimum="1" Maximum="100" Value="20" Name="zoom"/>
+
+		<ScrollViewer Grid.Row="2" HorizontalScrollBarVisibility="Auto">
+			<math:FormulaBlock Scale="{Binding #zoom.Value}" Formula="{Binding #formula.Text}" />
+		</ScrollViewer>
+
+		<Button x:Name="ConvertButton"
+				Content="Convert"
+				Padding="10,5"
+				Grid.Row="3"/>
+
+				<Grid ColumnDefinitions="*,auto" Grid.Row="6">
+			<TextBox Name="mathml" Text="hello!"/>
+			<Button x:Name="copyButton"
+				Content="copy"
+				Padding="10,5"
+				Grid.Row="0"
+				Grid.Column="1"/>
+		</Grid>
+	</Grid>
+</Window>

tex2mathml/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Xml.Xsl;
+using System.Xml;
+using System;
+
+namespace tex2mathml.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+
+        var ConvertButton = this.FindControl<Button>("ConvertButton");
+        ConvertButton.Click += ConvertButton_Click;
+
+        var copyButton = this.FindControl<Button>("copyButton");
+        copyButton.Click += CopyButton_Click;
+    }
+
+    private void CopyButton_Click(object? sender, RoutedEventArgs e)
+    {
+        Clipboard.SetTextAsync(mathml.Text);
+    }
+
+    public string GetWordDocumentAsMathML(string mathParagraphXml, string officeVersion = "14")
+    {
+        string officeML = string.Empty;
+
+        string testMathXml = @"<m:oMathPara xmlns:m=""http://schemas.openxmlformats.org/officeDocument/2006/math"">
+</m:oMathPara>";
+        Console.WriteLine(mathParagraphXml);
+        XslCompiledTransform xslTransform = new XslCompiledTransform();
+
+        // The OMML2MML.xsl file is located under 
+        // %ProgramFiles%\Microsoft Office\Office15\
+        xslTransform.Load(@"c:\Program Files\Microsoft Office\root\Office16" + @"\OMML2MML.XSL");
+
+        using (TextReader tr = new StringReader(mathParagraphXml))
+        {
+            // Load the xml of your main document part.
+            using (XmlReader reader = XmlReader.Create(tr))
+            {
+                using (MemoryStream ms = new MemoryStream())
+                {
+                    XmlWriterSettings settings = xslTransform.OutputSettings.Clone();
+
+                    // Configure xml writer to omit xml declaration.
+                    settings.ConformanceLevel = ConformanceLevel.Fragment;
+                    settings.OmitXmlDeclaration = true;
+
+                    XmlWriter xw = XmlWriter.Create(ms, settings);
+
+                    // Transform our OfficeMathML to MathML.
+                    xslTransform.Transform(reader, xw);
+                    ms.Seek(0, SeekOrigin.Begin);
+
+                    using (StreamReader sr = new StreamReader(ms, Encoding.UTF8))
+                    {
+                        officeML = sr.ReadToEnd();
+                        // Console.Out.WriteLine(officeML);
+                    }
+                }
+            }
+        }
+        return officeML;
+    }
+
+    private string ReplaceFirstOccurrence(string Source, string Find, string Replace)
+    {
+        int Place = Source.IndexOf(Find);
+        string result = Source.Remove(Place, Find.Length).Insert(Place, Replace);
+        return result;
+    }
+
+    private void ConvertButton_Click(object? sender, RoutedEventArgs e)
+    {
+        Process p = new Process();
+        p.StartInfo.FileName = "./assets/texmath.exe";
+        p.StartInfo.Arguments = "-f tex -t omml";
+        p.StartInfo.UseShellExecute = false;
+        p.StartInfo.RedirectStandardInput = true;
+        p.StartInfo.RedirectStandardOutput = true;
+        p.StartInfo.CreateNoWindow = true;
+        p.Start();
+        p.StandardInput.WriteLine($"{formula.Text}\n");
+        p.StandardInput.Flush();
+        p.StandardInput.Close();
+        string output = p.StandardOutput.ReadToEnd();
+        p.WaitForExit(); // This waits until the program called is closed
+
+        Debug.WriteLine("Output:");
+        Debug.WriteLine(output);
+
+        var result = ReplaceFirstOccurrence(output, @"<m:oMathPara>", @"<m:oMathPara xmlns:m=""http://schemas.openxmlformats.org/officeDocument/2006/math"">");
+
+        Debug.WriteLine("Convert Output:");
+        string final_result = (GetWordDocumentAsMathML(result));
+
+        mathml.Text = final_result;
+    }
+}

tex2mathml/tex2mathml.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="$(AvaloniaVersion)" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="AvaloniaMath" Version="2.1.0" />
+    <PackageReference Include="DocumentFormat.OpenXml" Version="3.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Update="Assets\texmath.exe">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </AvaloniaResource>
+  </ItemGroup>
+</Project>