Método IsPdfPortfolio del objeto Engine

HRESULT IsPdfPortfolio(
  BSTR                    FileName,
  IImagePasswordCallback* Callback,
  VARIANT_BOOL*           Result
);

bool IsPdfPortfolio(
  string                 FileName,
  IImagePasswordCallback Callback
);

Function IsPdfPortfolio( _
  FileName As String, _
  [Callback As IImagePasswordCallback = Nothing] _
) As Boolean