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Windows 11 and KB5012643, problems multiply – GinjFo

The list of issues related to Windows 11 update KB5012643 is growing. Fortunately, it is offered as an option. Obviously, downloading and installing it requires manual intervention on the part of the user.

Because it was posted online through the Windows Update service, it caused several crashes. One of the most problematic affected the safe mode. We are also having issues with popular Windows 11 apps like File Explorer.

Installing KB5012643 allows you to upgrade Windows 11 to version 22000.652. If its content is interesting, it is unfortunately the source of several more or less annoying bugs. Microsoft is the creator of the workarounds. One of them is to simply remove KB5012643.

Windows 11 and KB5012643

One of the latest reported issues is related to Windows 1 applications. Microsoft explains that some .NET Framework 3.5 programs may crash after installing KB5012643.

Windows 11 update KB5012643 is coming, what’s new?

We don’t have an exhaustive list of all potential issues, but one of them is interfering with some applications. This bug does not affect all .NET Framework 3.5 applications, only those that use optional .NET Framework 3.5 components such as Windows Communication Foundation (WCF) and Windows Workflow (WWF).

One workaround until a fix is ​​released is to remove KB5012463 from Windows Update. If that’s not possible, you can re-enable .NET Framework 3.5 and WCF from Windows Features. You can also do this via the command line by running the following commands

dism/online/enable-feature/featurename:netfx3/all
dism/online/enable-feature/featurename:WCF-HTTP-Activation
dism/online/enable-feature/featurename: WCF-NonHTTP-Activation

These solutions are temporary in the knowledge that Microsoft is working on this issue. However, we do not have an exact timetable. These crashes do not affect Windows 10 and Windows Server as KB5012643 only targets Windows 11 21H2.

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