This article will tell you how to fix the prompt for a missing Windows App Runtime environment when running non-packaged WinUI 3 applications on a customer’s machine.

The prompt for a missing Windows App Runtime environment on the user’s machine looks something like this:

This application requires the Windows App Runtime

Version 1.3

(MSIX package version >= 3000.882.2207.0)

Do you want to install a compatible Windows App Runtime now?

Clicking “Yes” will take you to the download page.

To fix this issue, you can download and install the Windows App Runtime installation package, WindowsAppRuntimeInstall.exe.

However, if an application requires users to install additional files like WindowsAppRuntimeInstall.exe, it is not ideal. This article will tell you how to make WinUI 3 applications work like traditional Win32 applications, where you can simply copy and run them on a user’s machine.

Step 1: Make sure the Microsoft.WindowsAppSDK NuGet package is version 1.2 or higher. The latest version as of 2023.6.15 is 1.3.230602002. According to the official documentation, the WindowsAppSdkUndockedRegFreeWinRTInitialize feature was added in version 1.2. To avoid the prompt mentioned above, it is best to have the WindowsAppSdkUndockedRegFreeWinRTInitialize feature.

Step 2: Configure the csproj project file by setting WindowsAppSDKSelfContained to true and WindowsPackageType to None. By default, when WindowsAppSDKSelfContained is set to true and WindowsPackageType is set to None, WindowsAppSdkUndockedRegFreeWinRTInitialize is automatically configured to true in the SDK.

The modified csproj project file looks something like this:

<Project Sdk="Microsoft.NET.Sdk">


    <!-- The following two lines of code are the core -->
    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.3.230602002" />
    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />

After making the above modifications, you can independently publish the application without requiring users to install the Windows App Runtime environment. Simply double-click to run the application.

As there is currently a lack of official documentation on WindowsAppSdkUndockedRegFreeWinRTInitialize and UndockedRegFreeWinRT, I am not familiar with the details of this knowledge. If you are interested, please explore it on your own.

中文博客:WinUI 3 修复非打包应用运行提示缺少 Windows App Runtime 环境

本文会经常更新,请阅读原文: ,以避免陈旧错误知识的误导,同时有更好的阅读体验。

如果你想持续阅读我的最新博客,请点击 RSS 订阅,推荐使用RSS Stalker订阅博客,或者收藏我的博客导航

知识共享许可协议 本作品采用 知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议 进行许可。欢迎转载、使用、重新发布,但务必保留文章署名林德熙(包含链接: ),不得用于商业目的,基于本文修改后的作品务必以相同的许可发布。如有任何疑问,请 与我联系



推荐关注 Edi.Wang 的公众号

欢迎进入 Eleven 老师组建的 .NET 社区