Also note that when importing FBX in blender, all materials will be like using "T1 shader". And GMT shaders with multiple channels may have incorrect texture assigned/seen in blender. Reassign texture could be a big headache, one way to avoid this is:
1. Load whole track in 3dsimed, use "material batch" option in 3dsimed to change all material to use T1 shader.
2. Save all file to a "temp" folder, then close this track, and reopen all files from "temp" folder. (this step is important)
3. Last, export all file to FBX and import in blender.