[DllImport("ole32.dll", SetLastError = true)]
public static extern int OleCreateFromFile(
[MarshalAs(UnmanagedType.LPStruct)] Guid rclsid,
[MarshalAs(UnmanagedType.LPWStr)] string lpszFileName,
ref Guid riid,
uint renderopt,
ref FORMATETC pFormatEtc,
IOleClientSite pClientSite,
IStorage pStg,
out object ppvObj
);