Create a new file parameter
        :param help_string:
        :param default:
        :param suffixes:
        :return:

def create_existing_file(help_string=NO_HELP, default=NO_DEFAULT, suffixes=None):
        # type: (str, Union[str, NO_DEFAULT_TYPE], Union[List[str], None]) -> str
        """
        Create a new file parameter
        :param help_string:
        :param default:
        :param suffixes:
        :return:
        """
        # noinspection PyTypeChecker
        return ParamFilename(
            help_string=help_string,
            default=default,
            type_name="existing_file",
            suffixes=suffixes,
        )