Iazu: According to WSGF..
www.wsgf.org/dr/anachronox/en
I've tried it myself and have the game running at 2880x1800 and everything seems to work splendidly.
Yep, this works for me at 1680x1050. The one thing I'll add for those reading this, is that I had to run the game first, set the in-game video option to "hi-res", and
then place those two files from WSG into my Anachronox folder for the fix to work. If I just dumped the two hack files from WSG into my Anachronox folder and boot it, it defaults to the "low res" setting of 800x600, ignoring the hacked files for some reason.
You'll know the resolution you set (say, 1680x1080) is working if the in-game menu is in 4:3 and not stretched- sure fire way to know. Either of the default resolution settings in-game will stretch the game menu on 16:10 or 16:9 monitors. Hope that helps someone!