... is a program called WinRez. It gives you access to the data files in LithTech games. You can find it with a web search.However, I'm not sure that the balance values that you'll want to change -- like weapon, armor, and character stats -- are accessible in the data files. I'm pretty sure those are hard-coded in the game engine, but have a look at the data files and tell us what you learn.
(Now I'll go and delete that redundant post.)