C# Definition:

[ComImport]
[Guid("0000013B-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IEnumSTATPROPSETSTG
{
     [PreserveSig]
     uint Next(
     uint celt,
     [Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] STATPROPSETSTG[] rgelt,
     out uint pceltFetched);

     void Skip(
     uint celt);

     void Reset();

     [return:MarshalAs(UnmanagedType.Interface)]
     IEnumSTATPROPSETSTG Clone();
}

VB Definition:

User-Defined Types:

public struct STATPROPSETSTG
{
     public Guid fmtid;
     public Guid clsid;
     public int grfFlags;
     public System.Runtime.InteropServices.ComTypes.FILETIME mtime;
     public System.Runtime.InteropServices.ComTypes.FILETIME ctime;
     public System.Runtime.InteropServices.ComTypes.FILETIME atime;
}

Notes:

Typical enumerator interface over the STATPROPSETSTG structure; typically returned by the IPropertySetStorage Enum method.

Note that Next() can return both S_OK and S_FALSE so the HRESULT return code must be preserved.