Geoff Chappell - Software Analyst
The IPersistString2 methods are (as ordered in the virtual function table after the IPersist methods):
HRESULT SetString (PCWSTR);
HRESULT GetString (PWSTR *);
The IPersistString2 interface is implemented by SHELL32 in version 6.00 and higher.
Though this interface dates from 2001, it was still not documented by Microsoft as late as the January 2007 edition of the Windows Vista Software Development Kit (SDK).