HOW TO: Set Up Your Video Card for Widescreen Gaming
If you’re one of the many who are jumping into widescreen gaming with the purchase of your first 
LCD, there are a few things you need to learn.
Most games simply aren’t designed with today’s widescreen aspect ratios in mine (16:10 is most common for desktop displays, and 16:9 for home cinema displays). Although more and more developers are factoring in widescreen gamers when designing their games, one look at our Widescreen Games Database will show you things are moving along slow, in terms of native widescreen resolutions.
The first thing you should do before attempting to play a game in widescreen is visit our database. Is the game listed there? Even though widescreen resolutions aren’t often supported officially, there are many ways to get a game to run in your native widescreen resolution. Sometimes this requires a registry edit; sometimes you need to change the command line a bit. In some cases, games will work perfectly, and even open up some of the view for you (widescreen monitors feature about 20% more width than standard screens of a respective size). Widescreen Gaming: How To Set Up Your Video Card in Widescreen - Widescreen Gamer