code: private function loadOLE($pFilename)
      {
          // OLE reader
          $ole = new OLERead();
          // get excel data,
          $ole->read($pFilename);
          // Get workbook data: workbook stream + sheet streams
          $this->data = $ole->getStream($ole->wrkbook);
          // Get summary information data
          $this->summaryInformation = $ole->getStream($ole->summaryInformation);
          // Get additional document summary information data
          $this->documentSummaryInformation = $ole->getStream($ole->documentSummaryInformation);
      }
docs: Use OLE reader to extract the relevant data streams from the OLE file.
  
  @param string $pFilename