code: def GetFileObject(self, data_stream_name=''):
      
      if data_stream_name:
        return None
  
      return resolver.Resolver.OpenFileObject(
          self.path_spec, resolver_context=self._resolver_context)
docs: Retrieves the file-like object.
  
      Args:
        data_stream_name (Optional[str]): name of the data stream, where an empty
            string represents the default data stream.
  
      Returns:
        FileIO: a file-like object or None if not available.