If you need to register it for all user profiles on the machine simultaneously, use this command instead: powershell
.appx is the older format. .msix is the modern evolution that combines .appx and MSI features. However, Microsoft.UI.Xaml.2.8 is distributed as .appx or .appxbundle for backward compatibility. Both formats install similarly with Add-AppxPackage .
This method is useful for system administrators or for scripting the installation. It also provides more detailed error messages if the installation fails.
You can also verify via:
Yes, but only if the Server installation includes the Desktop Experience and Windows App Installer features. Most Server Core installations do not support Appx framework packages.
Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.UI.Xaml.2.8_8wekyb3d8bbwe\AppXManifest.xml" Use code with caution.
If your default App Installer program is broken, you can manually register the file: Open . microsoft.ui.xaml.2.8 appx download
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Add-AppxPackage -Path "C:\Downloads\Microsoft.UI.Xaml.2.8.appx" -DependencyPath "C:\Downloads\Microsoft.VCLibs.x64.14.00.appx"
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. If you need to register it for all
Microsoft maintains the WinUI project on GitHub. While the primary distribution is via NuGet, release notes often link to direct artifacts.
There are three primary reasons this framework error occurs on Windows: