Unfortunately not.

When Discreet made GMax, it was intended to be a commercial venture. What they did was to give away the basic program free of charge, but then to licence the building of plugins that would allow models to be exported. The program itself is limited to saving models only in it's native format.

The cost of a plugin licence for GMax was a 5-figure sum when it first came out....

Some games ( Quake 3, MS Combat Flight Sim 3 and a few others ) have licensed plugins, but it is only really something that a big game manufacturer would profit from doing. For smaller developers, it just isn't worth paying out hte money to licence a plugin for their model format. You would have to shift a LOT of extra units to make it commercially viable.

Anyway...in short, I do not think there would ever actually be a way of making a freely available export script for GMax. The software is designed to prevent just that sort of thing!

Currently only 3DS Max has the necessary script to export. I have heard that some people are looking at other modelling software as an option. It needs to be something with basic skeletal support and easily obtainable. Both Blender and Milkshape have been mooted.