I think the way to do this is to find your acad.mnu file in r13
(Im not sure where it is on r13 but in 2000 its in the support folder)
and copy it over the 2000 one, but rename the 2000 .mnu file
to something else like .old just so you still have it.....
Actually I dont know if this will work, I usually use it
on 2000 to 2000 from one PC to another so they are the same,
not sure if it will work with r13, but its worth a shot!! Jay~
If its broken, just leave it and hope someone else fixes it!
~KeyTech