Second, I'd like to answer to the most recurrent question that is:"What about a FSX version?
As a side note, should anyone be interested, *IT IS* possible to convert gmax models to 3ds...well, at least partially. This is done using Quake 3d file format as interchange file format. Still, it is a long process as you have to split the model in small bits. While the textures coordinates are usually preserved, animations and materials are lost. And in most cases the geometry needs some manual fix.