Solved, but would like more info on world files

I'm not really sure what you mean? As I mentioned above we are still looking for any info from the Guru's (or people who figured them out) about the missing .bts in the thread I linked, as well as any more info on .GFX files. But we've already come such a long way since I was here, and those .bts aren't too important, would just be nice to have them to complete our research.