How to check if a DLL file is registered?

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You need to find out the GUID of a COM object defined in the DLL. Then look at this registry key:

HKEY_CLASSES_ROOT\CLSID\{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}\InprocServer32

Replace the x’s with the GUID.

It should have a default value that contains the full path to the DLL.

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