Thanks for the support guys
Well as i have figured out,every AI,character,weapon,object,action is packed into the .xin file.And the .xrg loads the level ingame.Also I found out that glukkons can be killed after they fall unconscious.New characters cannot be added(i havent totaly confirmed this yet),models of existing characters can be edited,replaced,reanimated.Animations are also controlled by the .xin file.Every character has a shadow in his model,and a collision box.The only problem is,I dont know witch file adds weapons to the model,Ill try to find this out today,and if I succeed I willl post pictures.
EDIT:seems that the .XBE and .XBEX files control most of the happenings in game.....thats quite sh...ush -.-