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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, windows_path):
 """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. """

    path_spec = self._path_resolver.ResolvePath(windows_path)
    if path_spec is None:
      return None

    return self._file_system.GetFileObjectByPathSpec(path_spec)