Windows 11 Preview Update Will Break Microsoft Store Apps

Windows 11 users may want to wait for one of the more recent preview updates, which causes issues for .NET Framework 3.5 apps. Fortunately, there are workarounds for the problem, but for now your best bet is probably to avoid the KB5012643 preview for now.

Microsoft has acknowledged the issue (via BeepComputer) in an update on the official website Windows 11 docs. It says the issue is limited to users running Windows 11 version 21H2 with update KB5012643 installed and means that apps using the .NET Framework 3.5 may not work properly, or even just fail to open.

This seems to affect specific components in the framework, so not all applications will be affected. It seems that applications running with optional features such as Windows Communication and Windows Workflow Foundation on the 3.5 framework are most likely to experience issues.

This can include many console applications and things like Windows Services. Microsoft hasn’t provided a list of the specific apps affected, so it’s best to assume it can affect a wide range of programs.

Microsoft recommends uninstalling the update if you encounter any issues. You can access it by going to your Windows update settings in your PC’s system settings. From there, you should be able to view your update history and revert to a previous version.

If this is not possible, the other solution is to re-enable .NET Framework 3.5 and Windows Communication Foundation in Windows Features found through Control Panel. Microsoft has further instructions on how to proceed, but restore is probably the easiest and most comprehensive solution if available. At least that 40 minute boot time bug has been fixed.

Of course, Microsoft is working to fix this problem instead of just offering workarounds. The .NET Framework 3.5 should be in mainstream support for another two years now, with five years of extended support to follow, so it’s not going anywhere anytime soon.

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