[Fincuan]

Here's another way, already posted in this or the other AI-thread, to check if you have a new AI: Open a few of supposedly working .class files with a text-editor. Destroy some lines here and there and write some gibberish all over the files. Save it and launch the game. Set up a QMB mission with one AI and fly to dot-range. If you haven't had a CTD by now you can be sure the game doesn't care about the .classes.

On another note 4.08 and .09 veteran AI and above like headons, where as those below that level don't do them that much if at all.