code: def OpenFile(self, windows_path):
      
      path_spec = self._path_resolver.ResolvePath(windows_path)
      if path_spec is None:
        return None
  
      return self._file_system.GetFileObjectByPathSpec(path_spec)
docs: Opens the file specificed by the Windows path.
  
      Args:
        windows_path (str): Windows path to the file.
  
      Returns:
        FileIO: file-like object or None if the file does not exist.