code: def _ParseVValueString(
        self, parser_mediator, data, user_information_descriptor):
      
      data_start_offset = (
          user_information_descriptor.offset + self._V_VALUE_STRINGS_OFFSET)
      data_end_offset = data_start_offset + user_information_descriptor.size
      descriptor_data = data[data_start_offset:data_end_offset]
  
      try:
        username = descriptor_data.decode('utf-16-le')
      except (UnicodeDecodeError, UnicodeEncodeError) as exception:
        username = descriptor_data.decode('utf-16-le', errors='replace')
        parser_mediator.ProduceExtractionWarning((
            'unable to decode V value string with error: {0!s}. Characters '
            'that cannot be decoded will be replaced with "?" or '
            '"\\ufffd".').format(exception))
  
      return username
docs: Parses a V value string.
  
      Args:
        parser_mediator (ParserMediator): mediates interactions between parsers
            and other components, such as storage and dfvfs.
        data (bytes): Windows Registry V value data.
        user_information_descriptor (user_information_descriptor): V value
            user information descriptor.
  
      Returns:
        str: string value stored in the Windows Registry V value data.