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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →In a WinUI 3 C# project, make four separate decisions: the package format, the Windows API level used at compile time, the oldest Windows release you will support, and how the Windows App SDK runtime reaches the user’s PC. The standard template starts with MSIX packaging. Keep that default when you need package identity, Microsoft Store delivery, identity-dependent Windows features, or managed installation and updates. Choose an unpackaged or external-location model only when your distribution process requires it, and then plan the runtime and launch profile explicitly.
The Windows version in TargetFramework is not the Windows App SDK version. It selects the Windows SDK API surface used to compile the app. SupportedOSPlatformVersion or TargetPlatformMinVersion declares the oldest operating system you support. Separately, a Windows App SDK app can use a framework-dependent runtime or carry a self-contained runtime. The settings below show how to align those choices with Store, enterprise, direct-download, and archive distribution.
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The four project decisions
Packaging: how Windows identifies and installs the app
Packaging determines whether the application has package identity and how it is installed. WinUI 3 templates are packaged as MSIX by default; Microsoft describes this default in its packaging and deployment overview. A Visual Studio build normally produces an .msix or .msixbundle.
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Target framework: which Windows APIs are available while compiling
The Windows-qualified target framework moniker (TFM) combines the .NET version with a Windows SDK contract. For example, net8.0-windows10.0.26100.0 tells the compiler to use the Windows API surface associated with SDK build 26100 while targeting .NET 8. A higher Windows component in the TFM can expose newer compile-time APIs; it does not, by itself, mean every supported computer must run that build.
Minimum OS: the oldest Windows release you will run on
SupportedOSPlatformVersion (or its SDK-style equivalent, TargetPlatformMinVersion) states the minimum Windows version your application supports. You can compile against a newer SDK while supporting an older operating system. For example, a project can compile against net8.0-windows10.0.26100.0 and declare a lower minimum such as 10.0.19041.0, provided every API introduced after that minimum is guarded or avoided. Microsoft explains the relationship between the TFM and minimum platform version in its Windows versions and SDK overview.
Runtime deployment: where the Windows App SDK comes from
Packaging and runtime deployment are independent. A packaged app can depend on a Windows App SDK framework package, while an unpackaged or external-location app must have the runtime supplied by your installer or by the application itself. Framework-dependent deployment keeps the app output smaller but requires a compatible runtime on the target machine. Self-contained deployment carries the Windows App SDK dependencies with the app, increasing output size and repeating that payload in updates.
Start with the template, then establish your support floor
- Record the project’s current settings. Open the
.csprojfile and noteTargetFramework,TargetPlatformMinVersionorSupportedOSPlatformVersion,WindowsPackageType,UseWinUI, andEnableMsixTooling. - Choose the compile-time Windows SDK. Select a Windows SDK installed on your build machine and supported by your chosen .NET and Windows App SDK versions. Put that version in the Windows portion of the TFM.
- Choose the oldest supported Windows release. Set the minimum to the oldest version you will actually test and support. A lower floor increases compatibility but requires more API guards and may exclude newer platform features.
- Check API guards. If code calls an API newer than the declared minimum, use the appropriate Windows version check or an API contract guard before calling it. The compiler’s platform warnings are useful signals; do not silence them without deciding how the app behaves on the older system.
Microsoft’s project-property guidance shows this illustrative shape:
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<PropertyGroup>
<OutputType>WinExe</OutputType>
<TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
<TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
<UseWinUI>true</UseWinUI>
<EnableMsixTooling>true</EnableMsixTooling>
</PropertyGroup>These values are examples, not universal requirements. Replace them with versions that match the SDKs installed in your build environment and the oldest Windows release your application supports. The project properties reference describes the available properties.
Choose packaging from the distribution channel
Decide how users will receive the application before changing the template. The packaging model affects identity, installation, updates, runtime provisioning, and the shape of your published output.
| Distribution scenario | Packaging direction | Runtime direction | Important consequence |
|---|---|---|---|
| Microsoft Store | Packaged MSIX | Framework-dependent is typical; the Store manages the framework package | Package identity and Store servicing are built into the delivery path |
| Direct MSIX download | Packaged MSIX or MSIX bundle | Distribute the required framework package, or publish self-contained where supported | Your installer or download process must account for runtime availability |
| Existing enterprise or custom installer that needs identity | External-location packaging | Framework-dependent or self-contained | Keep the existing installer while adding package identity; a framework-dependent runtime still needs deployment |
| Folder, ZIP, or xcopy distribution | Unpackaged | Self-contained usually simplifies setup; framework-dependent requires a runtime installation step | No package identity, so identity-dependent Windows features are unavailable |
Microsoft’s distribution-path guide maps these scenarios and notes that the best option can change as Windows distribution capabilities evolve. Recheck the current guidance when you publish.
Keep MSIX packaging when it solves a real requirement
For the default packaged project, leave MSIX tooling enabled and build the package through Visual Studio or your build pipeline. Choose this route when any of the following matter:
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- Microsoft Store submission.
- Package identity required by a Windows feature or API.
- Predictable install, uninstall, and update behavior.
- A managed enterprise deployment process that accepts MSIX.
- A single bundle that can contain more than one processor architecture.
Packaged applications can declare framework dependencies, allowing Windows to resolve a compatible Windows App SDK runtime package. The exact dependency and architecture settings still need to match the Windows App SDK release and the package manifest used by your project. Microsoft’s Windows App SDK deployment overview explains the packaged and unpackaged models.
Configure an unpackaged WinUI 3 application
Use unpackaged deployment when your users receive a folder, ZIP archive, or a conventional installer that does not install an MSIX package. The project must explicitly opt out of package deployment, and Visual Studio must launch the correct profile.
- Set the package type. Add this property to the project file:
<PropertyGroup>
<WindowsPackageType>None</WindowsPackageType>
</PropertyGroup>- Select the launch profile. In Visual Studio, choose the Unpackaged launch profile when running or debugging. If you keep a packaged profile selected, Visual Studio may try to deploy a package even though the project is configured for unpackaged output.
- Choose the runtime mode. For framework-dependent output, arrange for the matching Windows App SDK runtime to be installed by your setup program. For self-contained output, enable the Windows App SDK self-contained option so the application carries its runtime files.
- Test from a clean machine. Verify first launch, repair or reinstall behavior, upgrades, and removal on a computer that does not have your development environment or a previously installed Windows App SDK runtime.
The official procedure and required project properties are documented in Distribute an unpackaged WinUI 3 app. Unpackaged apps do not have package identity; do not promise Store-only or identity-dependent behavior in their documentation.
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Framework-dependent
Framework-dependent deployment expects the Windows App SDK runtime or framework package to be present on the target computer. It reduces the application’s download size and lets multiple applications share a runtime, but your installer, enterprise image, Store package, or prerequisite check must ensure the correct runtime is installed. A missing or incompatible runtime is a launch-time deployment failure, not a packaging-format problem.
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Self-contained
Self-contained deployment places the Windows App SDK dependencies beside the application. It is useful for direct distribution to machines you do not control, because users do not need a separate runtime installation. The trade-offs are a larger initial download, duplicated runtime files when several apps are installed, and a larger payload whenever you update the app.
For unpackaged distribution, Microsoft documents two practical approaches: bundle the Windows App SDK runtime installer in your own setup process, or enable self-contained deployment in the project. Select one deliberately; setting WindowsPackageType=None alone does not make an unpackaged application self-contained.
Publish for the architectures your users need
Publish binaries for every processor architecture you intend to support and test each one. A package can contain multiple architectures, allowing installation to select the applicable payload. For Windows on ARM, a native ARM64 build is recommended when performance and battery life matter; emulation is a compatibility fallback, not an equivalent performance target.
- x64: common for modern Intel and AMD Windows PCs.
- x86: include only if you still support 32-bit Windows hardware or a required legacy environment.
- ARM64: publish natively for Windows on ARM when you want the best performance and power efficiency.
Architecture support affects more than compilation. Native dependencies, installers, MSIX bundles, update packages, and any runtime payload must all contain matching binaries. A package that advertises an architecture without its corresponding native files will install or launch incorrectly.
Understand the limits of single-file publishing
PublishSingleFile is not a general switch for every WinUI 3 project. Microsoft supports the documented combination only for an unpackaged, self-contained .NET WinUI 3 app using Windows App SDK 1.5 or later. It is not supported for packaged applications or framework-dependent deployment.
The required project properties include:
<PropertyGroup>
<WindowsPackageType>None</WindowsPackageType>
<WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
<SelfContained>true</SelfContained>
<EnableMsixTooling>true</EnableMsixTooling>
<IncludeAllContentForSelfExtract>true</IncludeAllContentForSelfExtract>
<PublishSingleFile>true</PublishSingleFile>
</PropertyGroup>Adapt the properties to the project’s actual target framework, runtime identifier, and Windows App SDK version. The resulting “single file” is a distribution convenience, not a zero-extraction executable: dependencies extract to a temporary directory on first launch. Account for that first-run delay, temporary storage permissions, cleanup, and security tooling when diagnosing startup behavior. See Microsoft’s first-app publishing guide for the publishing workflow.
Build and validate each output
- Restore and build the intended configuration. Confirm that the selected TFM and Windows SDK are installed and that platform warnings are resolved or intentionally guarded.
- Publish per architecture. Produce the x64, x86, and ARM64 outputs you actually promise. Do not infer ARM64 support from a successful x64 build.
- Test the package form. Install the MSIX or bundle on a clean machine, and separately test the unpackaged folder or installer. A packaged test cannot prove that an unpackaged runtime setup works.
- Test runtime provisioning. For framework-dependent output, begin with no Windows App SDK runtime installed and verify that your prerequisite step installs the correct one. For self-contained output, verify that all runtime files are included and that an update replaces them correctly.
- Test the minimum OS. Run on the oldest Windows version declared by
TargetPlatformMinVersionorSupportedOSPlatformVersion. Exercise every code path that uses newer APIs. - Test first launch and upgrades. Check startup after installation, after an update, and after removing an older version. For single-file output, include a first-launch test that observes extraction and temporary-directory behavior.
Troubleshoot by separating the failure domains
The app builds but will not install
Check the package type, architecture, manifest, and signing or deployment prerequisites first. A target-framework change does not automatically fix a malformed MSIX or an architecture mismatch. If the project was intended to be unpackaged, confirm that WindowsPackageType is None and that you are not launching the packaged profile.
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This normally indicates a framework-dependent deployment whose Windows App SDK runtime was not supplied or is incompatible. Either make the installer deploy the required runtime or switch to self-contained deployment. Changing MSIX to unpackaged without addressing the runtime leaves the underlying problem unresolved.
An API compiles but fails on an older Windows release
Compare the API’s introduction level with the declared minimum OS. Keep the newer compile-time TFM if it provides useful APIs, but guard calls that exceed the minimum. Raising the minimum is a product-support decision: do it only when dropping older Windows versions is acceptable to your users.
Single-file publishing is rejected or produces unexpected output
Verify all constraints together: unpackaged project, Windows App SDK self-contained mode, .NET self-contained mode, Windows App SDK 1.5 or later, and single-file extraction properties. A packaged or framework-dependent project is outside the supported combination, even if PublishSingleFile is set.
Quick Recap
A practical decision sequence
- Start with identity. Need Store delivery or identity-dependent Windows features? Keep MSIX. Need an existing installer plus identity? Evaluate external-location packaging. Need a folder or ZIP? Use unpackaged deployment.
- Set the API surface. Choose a Windows-qualified TFM matching the SDK installed for your build and the APIs you intend to compile against.
- Set the support floor. Declare the oldest Windows version you will test, then guard newer APIs.
- Choose runtime ownership. Use framework-dependent deployment when your channel can reliably install or provide the runtime; use self-contained deployment when reducing target-machine prerequisites is more important than output size.
- Choose architectures. Publish every architecture your audience needs, including native ARM64 when Windows on ARM performance and battery life are priorities.
- Validate the real delivery artifact. Test the exact MSIX, installer, folder, or single-file output on clean machines at the minimum OS and each promised architecture.
Reference documentation
- Packaging and Deployment Options
- Windows App SDK deployment overview
- Distribute an unpackaged WinUI 3 app
- Windows versions and SDK overview
- Project properties and auto-initializers
- Choose a distribution path for your Windows app
- Publish your first Windows app
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