Some free versions of 3dSimed can't import .X files. You can then export the track to rFactor and import gmt's. You will recognise track, terrain, walls, objects and S-objects by file names. The other way is to export in parts - especially objects - you would have to delete some of them from btb temporarily to avoid quesing which ones you take. 3dSimed recognises textures, but for using them later in Max, I suggest to name the textures in 8.3 format at the beginning.