This was very easy to do back in the jaymod days I dont know the answer (yet) but here are some pointers ... arena files: http://magics-territory.com/et/et_info/level_designers_reference/etdocs/arenafile.html located in "gfx/loading/camp_map.tga" (TGA: 1024x1024 24bit) you can also get sagethumbs (no not my thumbs lol) for windows which will let you see the files in windows explorer http://s9.postimg.org/4scniycfj/sagethumbs.jpg