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I'm trying to find out why a program refuses to start on a particular computer. The error is:

LoadLibrary failed with error 87: The parameter is incorrect.

Which usually means that a dll is not available, either one that the program itself loads, or one of the dependencies of such a dll.

I have used Process Explorer to find the culprit and the last entry is

CreateFile c:\windows\SystemRessourcs\user32.dll.mun

That file indeed does not exist. There are many other files of the form somename.somecommonextension.mun in that directory.

I googled for that file name, but found nothing that helped. The file content looks like a regular dll.

Can anybody tell me what a .mun file is?

help-info.de
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dummzeuch
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  • Found some info here and on Google... [example](https://superuser.com/a/1480287/1773228) – Sylvain Feb 20 '23 at 16:21
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    MUN files are icon files in Windows 10 / 11. Have you got an app that does not have a proper icon? – John Feb 20 '23 at 16:31
  • This is about an error message I get from a program when I start it. No idea why it tries to access this file. It's possible that it tries to load an icon for displaying it on a form, but I simply don't know. – dummzeuch Feb 21 '23 at 08:25

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