IID_IRegItemCustomEnumerator {8DE4E39D-921D-410C-8467-D992B8489D72}

The IRegItemCustomEnumerator interface has just the one method (after the IUnknown methods):

Offset Method
0x0C GetCustomEnum

with prototype:

HRESULT GetCustomEnum (IShellFolder *, HWND, SHCONTF, IEnumIDList **);


The IRegItemCustomEnumerator interface is implemented in the SHELL32.DLL 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.