code: def _check_file(self):
          
          if not os.path.exists(self.file_path):
              return False
          self._migrate()
          config = configparser.RawConfigParser()
          config.read(self.file_path)
          try:
              config.get(
                  escape_for_ini('keyring-setting'),
                  escape_for_ini('password reference'),
              )
          except (configparser.NoSectionError, configparser.NoOptionError):
              return False
          try:
              self._check_scheme(config)
          except AttributeError:
              # accept a missing scheme
              return True
          return self._check_version(config)
docs: Check if the file exists and has the expected password reference.