The game does not support 4:3 resolutions. I am running at 1600x1200 and the highest res I could use was 1366x768.

Crazily enough it has eyefinity support and 5088x1200 ran perfectly.

Why is there no 4:3 support?

I posted this on the steam forums and this was the response I got, in case someone stumbles on this thread.

http://steamcommunity.com/app/241320/discussions/0/846959998012829378/?tscn=1374837544