AIW and cam files you can just leave as they are.
AIW can be improved on for Simbin games. PM or post when you get all working
Look at a working .gdb file on Gtr2 and you can easy see what you need and not need.
Rename files name ext as used by Gtr2.
Also file names some use the first 3 letter other use the first 4 letter.
Make two folder in the Jeddah folder. One for Textures and one for Objects (gmt)
Unpack the mas file with the .dds into the Texture folder and have 3Dsimed save the objects (Gmts) in the object folder you just created.
Copy a Skyboxi.gmt from a similar Gtr2 track into the object folder in Similar I mean track size.
Change top line in the .trk file so it can see the texture and object folder you just made and copy the rest from a working Gtr2 .trk file.
You should now have a track that shows in the Menu and will start.
If it doesn't work for you send me a PM with the link I I will try to at least make it work in Gtr2.