def files(self):
        """Set of found binary files output by StagYY."""
        if self._rundir['ls'] is UNDETERMINED:
            out_stem = pathlib.Path(self.par['ioin']['output_file_stem'] + '_')
            out_dir = self.path / out_stem.parent
            if out_dir.is_dir():
                self._rundir['ls'] = set(out_dir.iterdir())
            else:
                self._rundir['ls'] = set()
        return self._rundir['ls']
Set of found binary files output by StagYY.