code: def GetRootKey(self):
      
      regf_key = self._regf_file.get_root_key()
      if not regf_key:
        return None
  
      return REGFWinRegistryKey(regf_key, key_path=self._key_path_prefix)
docs: Retrieves the root key.
  
      Returns:
        WinRegistryKey: Windows Registry root key or None if not available.