I guess it's all about widescreen gaming now. Unfortunately for older game released before 2007 wide screen was not the norm as it were now and most of those games just support native 4:3 aspect ratio. To play those games in Wide screen format you'll need to tweak their configuration file (eg: setup.ini).
Confirmed solution for games that does not support widescreen format (AR of 16:9 or 16:10) can be found at the following site: Just a slight tweak and you will be able to play those games at widescreen, such as Red Alert 2!
Link : http://www.widescreengamingforum.com/forum/viewforum.php?f=32&sid=8bad311b6483b56ac615dcdb83b361a3