Adding this case to 9fs allows users to store vac scores
(as in vac's -f) in /lib/scores or $home/lib/scores and
run '9fs whatever.vac' to mount them using vacfs. I've
been using this for a few months to get at backups of
various unix systems, and it's a very nice, comfortable,
simple addition that I think is general enough to
warrant inclusion in the default 9fs.