code: def _ParseFileData(self, knowledge_base, file_object):
      
      text_file_object = dfvfs_text_file.TextFile(file_object, encoding='utf-8')
  
      product_values = {}
      for line in text_file_object.readlines():
        line = line.strip()
        if line.startswith('#'):
          continue
        key, value = line.split('=')
        key = key.strip().upper()
        value = value.strip().strip('"')
        product_values[key] = value
  
      if not knowledge_base.GetValue('operating_system_product'):
        system_product = product_values.get('DISTRIB_DESCRIPTION', None)
        if system_product:
          knowledge_base.SetValue('operating_system_product', system_product)
docs: Parses file content (data) for system product preprocessing attribute.
  
      Args:
        knowledge_base (KnowledgeBase): to fill with preprocessing information.
        file_object (dfvfs.FileIO): file-like object that contains the artifact
            value data.
  
      Raises:
        errors.PreProcessFail: if the preprocessing fails.