Geoff Chappell - Software Analyst
The IRegItemFolder methods are (as ordered in the virtual function table after the IUnknown methods):
HRESULT Initialize (REGITEMINFO const *);
in which REGITEMINFO is an invented typedef for an anonymous structure in the interface definition. The compiler-generated name is __MIDL_IRegItemFolder_0001.
The IRegItemFolder interface is implemented in SHELL32.DLL in the version 6.00 from Windows Vista, and higher.
Though new for Windows Vista, this interface is not documented by Microsoft in the January 2007 edition of the Software Development Kit (SDK) for Windows Vista.