HRESULT WINAPI InitPropVariantFromGUIDAsString(REFGUID guid, PROPVARIANT *ppropvar);
HRESULT WINAPI InitVariantFromGUIDAsString(REFGUID guid, VARIANT *pvar);
HRESULT WINAPI InitPropVariantFromBuffer(const VOID *pv, UINT cb, PROPVARIANT *ppropvar);
+HRESULT WINAPI InitPropVariantFromCLSID(REFCLSID clsid, PROPVARIANT *ppropvar);
HRESULT WINAPI InitVariantFromBuffer(const VOID *pv, UINT cb, VARIANT *pvar);
HRESULT WINAPI PropVariantToGUID(const PROPVARIANT *ppropvar, GUID *guid);
HRESULT WINAPI VariantToGUID(const VARIANT *pvar, GUID *guid);