Hey,
nowadays people use computerscreens with a ratio of 16:9 or 16:10 instead of 4:3.
Jedi Knight 2 does not support such a ratio, but there is a way to use it anyways.
You have to change 3 settings in your config file. We could do it also directly ingame
via the console.
Open the console (shift+^) and type in the following:
Code:
r_mode "-1"
r_customwidth "1920" (replace it by your width)
r_customheight "1200" (replace it by your height)
Restart the game and enjoy your new resolution

It's recommendable to play around with cg_fov to adjust it to your new resolution.
In console again:
Code:
cg_fov "120" (find the one you like)
Here is a screenshot (click it to enlarge):

I hope it was useful to someone.