No, OM# not work too!
I found out what is the problem!
Seems that sdif.dll needs another dynamic library called msvcr100.dll. So when OM# or OpenMusic tries to load sdif and not find the library it gives this error.
Maybe in Windows 11 Microsoft removed some components that use the library, and it is not delivered with Windows 11 anymore.
It’s good to know.
Will point out the solution,