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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _OpenFile(self, path):
 """Opens a Windows Registry file. Args: path (str):
 path of the Windows Registry file. Returns: WinRegistryFile: Windows Registry file or None if not available. """

    if not self._registry_file_reader:
      return None

    return self._registry_file_reader.Open(
        path, ascii_codepage=self._ascii_codepage)