Documentation
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Learn about the HKEY_LOCAL_MACHINE\SOFTWARE\Classes registry key, which associates a ProgID with a CLSID.
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ProgIDFromCLSID function (combaseapi.h) - Win32 apps
Retrieves the ProgID for a given CLSID.
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Registers new interfaces by associating an interface name with an interface ID (IID). There must be one IID subkey for each new interface.