def fix_ofiles(self):
        """
        This method is called when the task reaches S_OK.
        It changes the extension of particular output files
        produced by Abinit so that the 'official' extension
        is preserved e.g. out_1WF14 --> out_1WF
        """
        filepaths = self.outdir.list_filepaths()
        #logger.info("in fix_ofiles with filepaths %s" % list(filepaths))

        old2new = FilepathFixer().fix_paths(filepaths)

        for old, new in old2new.items():
            self.history.info("will rename old %s to new %s" % (old, new))
            os.rename(old, new)