Add multi-headed MSIX package sample apps

Samples/MultiHeadedPackage/README.md

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+---
+page_type: sample
+languages:
+- csharp
+products:
+- windows
+- windows-app-sdk
+name: "Multi-headed MSIX package sample"
+urlFragment: multi-headed-package
+description: "Shows how to package multiple executables in a single MSIX or sparse package"
+extendedZipContent:
+- path: LICENSE
+  target: LICENSE
+---
+# Multi-headed MSIX package sample
+
+These samples demonstrate how to create **multi-headed packages** — MSIX or sparse packages that contain multiple `<Application>` elements in a single `Package.appxmanifest`. Each application entry gets its own Start menu tile and can be launched independently, while sharing the same package identity and installation lifecycle.
+
+## Samples
+
+### MSIX sample (`cs/cs-winui-msix/`)
+
+A WinUI 3 solution using single-project MSIX packaging with two projects:
+
+- **PrimaryApp** — The main WinUI app that owns the package manifest. Uses `$targetnametoken$` tokens so the build system fills in the correct executable name.
+- **SecondaryApp** — A secondary WinUI app referenced by PrimaryApp. Its executable name is hardcoded in the manifest as `SecondaryApp.exe` with `EntryPoint="Windows.FullTrustApplication"`.
+
+After deployment, both apps appear in the Start menu as separate entries.
+
+### Sparse sample (`cs/cs-wpf-sparse/`)
+
+A WPF solution demonstrating multi-headed sparse packages with runtime registration:
+
+- **PrimaryApp** — A WPF app with `WindowsPackageType=Sparse` that includes Register/Unregister/Restart buttons to manage the sparse package at runtime.
+- **SecondaryApp** — A minimal WPF app that detects whether it has package identity (which it will once the sparse package is registered).
+
+## Prerequisites
+
+* See [System requirements for Windows app development](https://docs.microsoft.com/windows/apps/windows-app-sdk/system-requirements).
+* Make sure that your development environment is set up correctly&mdash;see [Install tools for developing apps for Windows 10 and Windows 11](https://docs.microsoft.com/windows/apps/windows-app-sdk/set-up-your-development-environment).
+
+## Building and running
+
+### MSIX sample
+
+1. Open `cs/cs-winui-msix/MultiHeadedMsix.sln` in Visual Studio.
+2. Set **PrimaryApp** as the startup project.
+3. Press **F5** to build, deploy, and launch the primary app.
+4. Check the Start menu for both "Primary App" and "Secondary App" entries.
+
+### Sparse sample
+
+1. Open `cs/cs-wpf-sparse/MultiHeadedSparse.sln` in Visual Studio.
+2. Set **PrimaryApp** as the startup project.
+3. Press **Ctrl+F5** to run without debugging.
+4. Click **Register Package** to register the sparse package.
+5. Click **Restart** to relaunch with package identity.
+6. Run **SecondaryApp** separately to verify it also detects the package identity.
+
+## Related links
+
+- [Windows App SDK](https://docs.microsoft.com/windows/apps/windows-app-sdk/)
+- [Single-project MSIX packaging](https://docs.microsoft.com/windows/apps/windows-app-sdk/single-project-msix)
+- [Sparse packages](https://docs.microsoft.com/windows/apps/desktop/modernize/grant-identity-to-nonpackaged-apps)
+- [WindowsAppSDK issue #5586](https://github.com/microsoft/WindowsAppSDK/issues/5586)

Samples/MultiHeadedPackage/cs/cs-winui-msix/MultiHeadedMsix.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31717.71
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PrimaryApp", "PrimaryApp\PrimaryApp.csproj", "{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SecondaryApp", "SecondaryApp\SecondaryApp.csproj", "{B2C3D4E5-F6A7-8901-BCDE-F12345678901}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM64 = Debug|ARM64
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|ARM64 = Release|ARM64
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|ARM64.Build.0 = Debug|ARM64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|ARM64.Deploy.0 = Debug|ARM64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|x64.ActiveCfg = Debug|x64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|x64.Build.0 = Debug|x64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|x64.Deploy.0 = Debug|x64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|x86.ActiveCfg = Debug|x86
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|x86.Build.0 = Debug|x86
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Debug|x86.Deploy.0 = Debug|x86
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|ARM64.ActiveCfg = Release|ARM64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|ARM64.Build.0 = Release|ARM64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|x64.ActiveCfg = Release|x64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|x64.Build.0 = Release|x64
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|x86.ActiveCfg = Release|x86
+		{A1B2C3D4-E5F6-7890-ABCD-EF1234567890}.Release|x86.Build.0 = Release|x86
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Debug|ARM64.Build.0 = Debug|ARM64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Debug|x64.ActiveCfg = Debug|x64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Debug|x64.Build.0 = Debug|x64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Debug|x86.ActiveCfg = Debug|x86
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Debug|x86.Build.0 = Debug|x86
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Release|ARM64.ActiveCfg = Release|ARM64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Release|ARM64.Build.0 = Release|ARM64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Release|x64.ActiveCfg = Release|x64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Release|x64.Build.0 = Release|x64
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Release|x86.ActiveCfg = Release|x86
+		{B2C3D4E5-F6A7-8901-BCDE-F12345678901}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D1E2F3A4-B5C6-7890-DEFA-123456789ABC}
+	EndGlobalSection
+EndGlobal

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/App.xaml

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+<!-- Copyright (c) Microsoft Corporation.
+     Licensed under the MIT License. -->
+<Application
+    x:Class="PrimaryApp.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:PrimaryApp">
+</Application>

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/App.xaml.cs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using Microsoft.UI.Xaml;
+
+namespace PrimaryApp
+{
+    public partial class App : Application
+    {
+        private Window mainWindow;
+
+        public App()
+        {
+            this.InitializeComponent();
+        }
+
+        protected override void OnLaunched(LaunchActivatedEventArgs args)
+        {
+            mainWindow = new MainWindow();
+            mainWindow.Activate();
+        }
+    }
+}

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/MainWindow.xaml

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+<!-- Copyright (c) Microsoft Corporation.
+     Licensed under the MIT License. -->
+<Window
+    x:Class="PrimaryApp.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    Title="Primary App - Multi-Headed MSIX">
+
+    <Grid VerticalAlignment="Center" HorizontalAlignment="Center">
+        <StackPanel Spacing="16">
+            <TextBlock
+                Text="This is the Primary App"
+                FontSize="28"
+                HorizontalAlignment="Center" />
+            <TextBlock
+                Text="This app is part of a multi-headed MSIX package."
+                FontSize="16"
+                HorizontalAlignment="Center"
+                Foreground="{ThemeResource TextFillColorSecondaryBrush}" />
+            <TextBlock
+                Text="Check your Start menu for both 'Primary App' and 'Secondary App' entries."
+                FontSize="14"
+                HorizontalAlignment="Center"
+                Foreground="{ThemeResource TextFillColorTertiaryBrush}"
+                TextWrapping="Wrap"
+                TextAlignment="Center" />
+        </StackPanel>
+    </Grid>
+</Window>

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/MainWindow.xaml.cs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using Microsoft.UI.Xaml;
+
+namespace PrimaryApp
+{
+    public sealed partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            this.InitializeComponent();
+        }
+    }
+}

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/Package.appxmanifest

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+<?xml version="1.0" encoding="utf-8"?>
+
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+  IgnorableNamespaces="uap rescap">
+
+  <Identity
+    Name="MultiHeadedMsixSample"
+    Publisher="CN=Microsoft Corporation"
+    Version="1.0.0.0" />
+
+  <Properties>
+    <DisplayName>Multi-Headed MSIX Sample</DisplayName>
+    <PublisherDisplayName>Microsoft Corporation</PublisherDisplayName>
+    <Logo>Assets\logo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate"/>
+  </Resources>
+
+  <Applications>
+    <!-- Primary: tokens replaced by build system -->
+    <Application Id="App"
+      Executable="$targetnametoken$.exe"
+      EntryPoint="$targetentrypoint$">
+      <uap:VisualElements
+        DisplayName="Primary App"
+        Description="Primary application in multi-headed package"
+        BackgroundColor="transparent"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png" />
+        <uap:SplashScreen Image="Assets\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+
+    <!-- Secondary: hardcoded exe name, no tokens -->
+    <Application Id="SecondaryApp"
+      Executable="SecondaryApp.exe"
+      EntryPoint="Windows.FullTrustApplication">
+      <uap:VisualElements
+        DisplayName="Secondary App"
+        Description="Secondary application in multi-headed package"
+        BackgroundColor="transparent"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+
+  <Capabilities>
+    <rescap:Capability Name="runFullTrust" />
+  </Capabilities>
+</Package>

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/PrimaryApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows10.0.19041.0</TargetFramework>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>PrimaryApp</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <Platforms>x86;x64;ARM64</Platforms>
+    <RuntimeIdentifiers>win10-x86;win10-x64;win10-arm64</RuntimeIdentifiers>
+    <UseWinUI>true</UseWinUI>
+    <EnableMsixTooling>true</EnableMsixTooling>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.5.240227000" />
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.3233" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="Assets\SplashScreen.png" />
+    <Content Include="Assets\Square150x150Logo.png" />
+    <Content Include="Assets\Square44x44Logo.png" />
+    <Content Include="Assets\logo.png" />
+    <Content Include="Assets\Wide310x150Logo.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <!-- Secondary app included in the MSIX package -->
+    <ProjectReference Include="..\SecondaryApp\SecondaryApp.csproj" />
+  </ItemGroup>
+
+  <!-- Defining the "Msix" ProjectCapability here allows the Single-project MSIX Packaging
+       Tools extension to be activated for this project even if the Windows App SDK Nuget
+       package has not yet been restored -->
+  <ItemGroup Condition="'$(DisableMsixProjectCapabilityAddedByProject)'!='true' and '$(EnablePreviewMsixTooling)'=='true'">
+    <ProjectCapability Include="Msix" />
+  </ItemGroup>
+</Project>

Samples/MultiHeadedPackage/cs/cs-winui-msix/PrimaryApp/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="PrimaryApp.app"/>
+
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <!-- The combination of below two tags have the following effect:
+           1) Per-Monitor for >= Windows 10 Anniversary Update
+           2) System < Windows 10 Anniversary Update
+      -->
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/PM</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>

Samples/MultiHeadedPackage/cs/cs-winui-msix/SecondaryApp/Program.cs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System;
+
+namespace SecondaryApp
+{
+    class Program
+    {
+        static void Main()
+        {
+            Console.WriteLine("=== Secondary App - Multi-Headed MSIX ===");
+            Console.WriteLine();
+            Console.WriteLine("This is the Secondary App.");
+            Console.WriteLine("Both this app and the Primary App were installed from the same MSIX package.");
+            Console.WriteLine();
+            Console.WriteLine("Press any key to exit...");
+            Console.ReadKey();
+        }
+    }
+}

Samples/MultiHeadedPackage/cs/cs-winui-msix/SecondaryApp/SecondaryApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0-windows10.0.19041.0</TargetFramework>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>SecondaryApp</RootNamespace>
+    <Platforms>x86;x64;ARM64</Platforms>
+    <RuntimeIdentifiers>win10-x86;win10-x64;win10-arm64</RuntimeIdentifiers>
+    <!-- No EnableMsixTooling, no Package.appxmanifest — this project is packaged by PrimaryApp -->
+  </PropertyGroup>
+</Project>