public void Stat(out System.Runtime.InteropServices.ComTypes.STATSTG pstatstg, int grfStatFlag) {
pstatstg = new System.Runtime.InteropServices.ComTypes.STATSTG();
pstatstg.cbSize = mInner.Length;
pstatstg.type = 2; // stream type
pstatstg.pwcsName = (mInner is FileStream) ? ((FileStream)mInner).Name : String.Empty;
}