$200 to decode this .dat 3D mesh file from an XBox game

[toddkay]

I'm trying to recover the ground terrain 3D geometry for a specific track in the XBox racing game RalliSport Challenge 2.

I have extracted all the files that make up the track, and now have these two .dat files as candidates that may contain the geometry I'm looking for.

streammesh.dat
track.dat

I do not know the difference between these, or which one has the actual ground surface 3D geometry in it. I'm assuming it's streammesh.dat, but I would be interested in your input regarding which one is the better bet to work on extracting. (files attached here)

Will pay $200 for 1 delivered 3D mesh file of the ground terrain, in OBJ format, ideally with UVs intact if this isn't too huge of an extra burden, but will take what I can get.
If it is a success working together, and you are interested in doing more of these, I may have additional files from this same game which I would pay additional fees for.

Please send me a PM if you're interested in helping out. Thanks very much, I appreciate it!!
-Todd