def find_trace_file(mname):
        """Tries to find the traces tdms file name

        Returns None if no trace file is found.
        """
        mname = pathlib.Path(mname)
        tname = None

        if mname.exists():
            cand = mname.with_name(mname.name[:-5] + "_traces.tdms")
            if cand.exists():
                tname = cand

        return tname