Yeah! I love gmax, i sometimes use it still. I too, wish we would have gotten the UT’03 exporter but then '04 came out and well yeah i see why they never released it.
I did find this site which has a bunch of older 3dsmax and GMAX scripts and Chris Cookson’s MD3 Export plugin, its an updated version of the pop’n’fresh MD3 exporter. That might be useful if bone animations don’t work with the obj script or you have a very large file and you can’t select all the text in the listener.