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I have the code for various versions of a software product I work on on my machine. The product includes one or more assemblies that are registered for com interop. How can I determine which one is currently registered?

+1  A: 

If you know the GUID of your assembly, look under HKCR\CLSID\{your guid}\InprocServer32. The Assembly key will have a value including the version.

If you only have the ProgId, you can just search the registry for that string which will tell you the GUID.

Nick