Forum Discussion

Edoardo's avatar
Edoardo
Copper Contributor
Apr 05, 2026

Windows 11 build 26200.8116 broke system dll crtdll.dll

Latest Windows 11 25H2 release broke this system dll by replacing it with msvcrt40.dll which isn't anywhere like it, and it broke 32 bit programs that relied on that dll to run since it is missing symbols.

I couldn't find an appropriate space to report this kind of issues, since this is not user error or a configuration problem, but a bug caused by a windows update that only has meaning for developers and users which use the very few apps remaining relying on this component.

If there's a better way to report this issue, let me know, but I have no direct access to a Windows 11 device so i can't use the feedback hub application

dev

4 Replies

  • Tyler3412's avatar
    Tyler3412
    Copper Contributor
    Apr 09, 2026

    This looks like a regression in the Windows update. Try restoring the original DLL using System File Checker (sfc /scannow) or rolling back the update until Microsoft Windows fixes it. If you can’t access Feedback Hub, report it via Microsoft’s web-based support or developer channels so it actually gets tracked.

  • Lucienw's avatar
    Lucienw
    Iron Contributor
    Apr 09, 2026

    Restore the original crtdll.dll file from the Windows 10 system or a backup to the C:\Windows\SysWOW64 directory, and register the DLL.

     

     

  • Azraelen's avatar
    Azraelen
    Brass Contributor
    Apr 07, 2026

    You can create a post in the Microsoft Support Forums, specifically in the Windows 11 section. This will allow you to reach a community of users and Microsoft representatives who may be able to assist you. Make sure to provide detailed information about the issue, including the error messages and any relevant logs.