Error importing a .pyd file (as a python module) from a .pyo file

It's typically because of one or more of the following:

• The .pyd is not in your current path (you said it was in the same folder so that should not be the problem)
• A DLL the .pyd depends on is not in your current path. Locate the missing DLL's using depends.exe or its modern rewrite and either copy these dll's to the same folder or add the containing directories to your system path
• You're using a debug version of python. Then the module must be renamed from xyz.pyd to xyz_d.pyd.