Easy,
Change your rule from:
=VALID(RUN("Test2",ECHOIN(1,In1)+" -OF1 Output.txt"),FAIL(LASTERRORCODE()))
to
=VALID(RUN("Test2",ECHOIN(1,In1)+" -OASINK1K'Output.txt'"),FAIL(LASTERRORCODE()))
...sending the output to SINK, but forcing a creation of a backup, to contain the actual data, even...