Blitzkrieg

The game's FOV is directly proportional to your resolution. The more pixels in your resolution, the more territory you can see at once. For example, 1280x800 will appear to be wider and a little bit taller than 1024x768, but 1280x1024 will appear equally wide as 1280x800 and taller.

I have tested this on my desktop, which goes up to 1280x1024. All tested resolutions worked natively. But I also tested it on my 1680x1050 laptop, and 1680x1050 did not work, even if I tried to edit it into the config file. I suspect that 1280x1024 is the max resolution for this game, but anything beneath that will work.