How do you mod?

[Zechnophobe]

Spamm has his sticky up top that allows you to add some .kfs files into a directory, which I was a little surprised to find were not actually a fancy name for a plain text file like in most mods.

So I have to ask, what exact process is used for modding? Is the .kfs an encrypted text file that just overwrites game data if detected? If so, how do you open, modify, etc?

Thanks!

Oh, I wanted to make a simple mod that shows at the bottom of the combat mouseover (When choosing a target to attack) the current crit chance of the strike, and the damage it will do if it hits.