In bi/data/UI/roman I saw a file called evenpics. If I wanted to use these images to change the RTW images (which is use by RTR) for BI image like siege , sally etc, what file should I look into ? I know in vanilla RTW (and RTR) the eventpics and UI are inside the packs file.

Is there a way to change the image without unpacking the pack files etc by editing the relevant text files ? I also tried to change pictures and models for assasing and diplomats from BI into RTR, but in the game it still shows RTW/RTR assasins & diplomats in campaign map.

Anyone have any ideas ?