Whoops! Was on about the wrong thing earlier, ignore what I said in my last post on this thread.
biohazard uses the trov chassis glitch and you will need to set the graphics to low in order for it to load in game. there's a txt in the dsl 2.2 folder i believe that
Clickbeetle explained how to make the Trovaner Chassis Glitch trick work before in DSL BBEANS AI on high graphics. Here's the tips, copied directly from the .txt file that came with the AI pack:
1. Open the options menu and set the graphic quality to "High" if it isn't already. Click OK.
2. Do a battle. Doesn't matter what arena or what bots.
3. Open the options menu again and set the graphic quality to "Low".
4. Quit the game immediately WITHOUT DOING ANY BATTLES OR ENTERING THE BOT LAB.
5. Boot up RA2 again. The game will now "think" it is running in low quality, but it is actually using high quality.
You should be all set after following the steps. It usually works only within one try, too. Also, please excuse it as well if it doesn't work for you, the .txt file (and AI pack) is at least 7 years old.