docs: def warning(self, msg: str) -> None:
          """
          Write a warning message to the Windows Application log
          (± to the Python disk log).
          """
          # Log messages go to the Windows APPLICATION log.
          # noinspection PyUnresolvedReferences
          s = "{}: {}".format(self.fullname, msg)
          servicemanager.LogWarningMsg(s)
          if self.debugging:
              log.warning(s)