IQueryInfo (Interfaces)
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The Shell uses the IQueryInfo interface to retrieve flags and info tip information for an item that resides in an IShellFolder implementation. Info tips are usually displayed inside of a ToolTip control.

    interface IQueryInfo
        int GetInfoTip(
            int dwFlags,
            [MarshalAs( UnmanagedType.LPWStr )] out string ppwszTip );

        int GetInfoFlags( out int pdwFlags );

    // ppwszTip will be freed by marshler using CoTaskMemFree()

IQueryInfo on MSDN