code: def _ParseKey(self, knowledge_base, registry_key, value_name):
      
      user_account = artifacts.UserAccountArtifact(
          identifier=registry_key.name, path_separator='\\')
  
      registry_value = registry_key.GetValueByName('ProfileImagePath')
      if registry_value:
        profile_path = registry_value.GetDataAsObject()
        username = self._GetUsernameFromProfilePath(profile_path)
  
        user_account.user_directory = profile_path or None
        user_account.username = username or None
  
      try:
        knowledge_base.AddUserAccount(user_account)
      except KeyError:
        # TODO: add and store preprocessing errors.
        pass
docs: Parses a Windows Registry key for a preprocessing attribute.
  
      Args:
        knowledge_base (KnowledgeBase): to fill with preprocessing information.
        registry_key (dfwinreg.WinRegistryKey): Windows Registry key.
        value_name (str): name of the Windows Registry value.
  
      Raises:
        errors.PreProcessFail: if the preprocessing fails.