You can unpack the whole game's resources into an 'assets' folder in your installation directory. Just drag the .bin from the hammerwtch folder to the resourceextractor.
If you're looking for the actual AI it's in the .exe file, decompile that and look at the ARPGGame.ActorBehaviors namespace. The most interesting ones are probably BaseEnemyBehavior, MeleeActorBehavior, RangedActorBehavior, CasterActorBehavior.