http://dynamic2.gamespy.com/~phrozenkeep/ubb/Forum33/HTML/000084.htmlFor questions about general hexediting, go to the code forums.
About the cof files editing, I don't think that's truly necessary, although it might be useful to know how to do it. Just use appropriate cofs from another monster to get the results you want. Myhrginoc was studying the cof files structure, maybe he can help you more here.
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"Get me a balrog attack-1 hand-to-hand animation, and I want it yesterday, the paladin is almost here!" ---> DMA1HTH @ offset 0006A480h. - Myhrginoc