There are many unused files in RA2 (not just graphics or components). For whatever reason, Gabriel Interactive didn't bother to remove them when they made the distributable copy of the game. They also have some unfinished code in the EXE like the heat values for chassis armor (they are adjustable but don't do anything) or the difficulty settings (I don't think we can even access them without a modified EXE).
If not for the obstacle course graphic, nobody would have known that the EXE allowed a sixth exhibition mode. Buttons don't usually work unless the EXE knows to call them (which is why we can't add anymore modes). I have all the DSL arenas inside of my stock game so with a small edit of a GIB file, I was able to use the obstacle course's temp graphic to access the arenas from DSL's sixth mode.
