Can anyone analyze these .mesh/.track/.animesh/.skeleton file formats and write a tool or new Blender plugin to import .mesh and .track?

Thanks in advance.

motogpurt_trackmodel.rar motogpurt_bikemeshes.rar motogpurt_charactermodelandskeleton.rar

Sir, I suggest you do some research on your own first before posting questions next time, and provide more useful details like model structure. Others can then quickly locate what they need with your information.

Now back to the topic. The track file is indeed the race track model as you said. Its chunks are scattered and the storage structure has minor deviations, yet it is not complicated. Obvious vertex data lies right after the header info. I sampled an offset at 0x0003F4E8, where the data size is roughly between 9000 and 10000 bytes, belonging to the main track model. It may also contain decorative scene assets. I haven't dug deeper into it.