I changed all the Jedi Academy Models I used for NWN into 3ds with Milkshape (and gmax imports 3ds quite happily all on its own).
If you're trying to do anything with models from those games, Milkshape's a good middle step. Works very well for quite a few other formats too. Very simple to just import "X" format and export as 3ds.
PS:- I've been using the updated OBJ. importer script (ver1.1a) on that list for a little while and it works well. (For some reason the mesh is invisible when you first import an OBJ. but save it to an Aurora base and then reload it and it's all there fine - and visible).