Base project

src/GuiApp/Avalonia/FileTime.GuiApp/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="using:FileTime.GuiApp"
+             x:Class="FileTime.GuiApp.App">
+    <Application.DataTemplates>
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <FluentTheme Mode="Light"/>
+    </Application.Styles>
+</Application>

src/GuiApp/Avalonia/FileTime.GuiApp/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using FileTime.GuiApp.ViewModels;
+using FileTime.GuiApp.Views;
+
+namespace FileTime.GuiApp
+{
+    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 MainWindowViewModel(),
+                };
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+    }
+}

src/GuiApp/Avalonia/FileTime.GuiApp/FileTime.GuiApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+	<!--Avalonia doesen't support TrimMode=link currently,but we are working on that https://github.com/AvaloniaUI/Avalonia/issues/6892 -->
+	<TrimMode>copyused</TrimMode>
+	<BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+	<ApplicationIcon>Assets\filetime.ico</ApplicationIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\**" />
+    <None Remove=".gitignore" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Assets\filetime.ico" />
+  </ItemGroup>
+  <ItemGroup>
+	<!--This helps with theme dll-s trimming.
+	If you will publish your application in self-contained mode with p:PublishTrimmed=true and it will use Fluent theme Default theme will be trimmed from the output and vice versa.
+	https://github.com/AvaloniaUI/Avalonia/issues/5593 -->
+	<TrimmableAssembly Include="Avalonia.Themes.Fluent" />
+	<TrimmableAssembly Include="Avalonia.Themes.Default" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="0.10.13" />
+    <PackageReference Include="Avalonia.Desktop" Version="0.10.13" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="0.10.13" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="0.10.13" />
+	<PackageReference Include="XamlNameReferenceGenerator" Version="1.3.4" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\AppCommon\FileTime.App.DependencyInjection\FileTime.App.DependencyInjection.csproj" />
+  </ItemGroup>
+</Project>

src/GuiApp/Avalonia/FileTime.GuiApp/Program.cs

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+using System;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.ReactiveUI;
+
+namespace FileTime.GuiApp
+{
+    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()
+                .LogToTrace();
+    }
+}

src/GuiApp/Avalonia/FileTime.GuiApp/ViewModels/MainWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace FileTime.GuiApp.ViewModels
+{
+    public class MainWindowViewModel
+    {
+    }
+}

src/GuiApp/Avalonia/FileTime.GuiApp/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:FileTime.GuiApp.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="FileTime.GuiApp.Views.MainWindow"
+        Icon="/Assets/filetime.ico"
+        Title="FileTime.GuiApp">
+
+    <Design.DataContext>
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+
+</Window>

src/GuiApp/Avalonia/FileTime.GuiApp/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace FileTime.GuiApp.Views
+{
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}