these files within a software like Blender or Unity, could you please specify the file extension of the contents? COLLADA files explained and how to use them - Adobe
If you could provide more details or clarify your question, I'd be more than happy to offer a more targeted response.
The "3 sets" designation usually refers to different photographic sequences or "looks" captured during a single session with the model, Chelda. Who is Chelda?