KB5012643 for Windows 11 may crash some .Net applications

Microsoft released preview update KB5012643 for Windows 11 on April 25, 2022. Preview updates are not installed automatically through Windows Update; Microsoft uses preview builds to test updates and fix potential issues that arise through user reports or telemetry data.

The April 2022 preview update for Windows 11 appears to cause issues with some .NET Framework apps after they are installed on a device.

The entries under Known Issues provide IT administrators with the following information:

After you install this update, some .NET Framework 3.5 apps may have issues or fail to open. The affected apps are using certain optional components in the .NET Framework 3.5, such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) components.

This issue appears to be limited to certain applications that use the optional .NET Framework 3.5 component. Microsoft has not provided examples of such apps, but users may notice crashes or other issues when launching affected apps on Windows 11 devices.

Microsoft recommends two mitigations to resolve this issue:

1. Remove Windows Update KB5012643 from the device. Administrators can do this by:
   • Open Start and type Windows Update Settings.
   • Select View update history, and then select Uninstall updates.
   • Find KB5012643 in the list, select it, and activate the uninstall operation.
2. Re-enable .NET Framework 3.5 and Windows Communication Foundation in Windows Features. IT administrators can do this by running the following comment from an elevated command prompt window:
   • dism /online /enable-feature /featurename:netfx3 /all
   • dism /online /enable- feature /featurename:WCF-HTTP-Activation
   • dism /online /enable-feature /featurename:WCF-NonHTTP-Activation

Microsoft plans to use Fixes will be released in an upcoming update. It's unclear if this will appear in next week's May 2022 Patch Day update, or if the issue will be addressed in a future update.

Windows 10 preview updates do not appear to cause problems on systems where they are installed.

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