It will only work on 16:9 resolutions. Any other resolution and it will not work without adjusting the coordinates yourself. I have been asked on several occasions to make a 800x600 windowed version... and I keep meaning to get around to it, but I get distracted
However, there are some people here running a non 16:9 resolution who have already made the changes. They may be able to provide you with a working version. What res are you running?