That doesn't fix for wide screen, that crops it out severely reducing the field of view (or FOV).
Here's an example of what I'm talking about:
Cropped: http://screenshot.xfire.com/screenshot/nat...a6ace78fec4.png
Fixed: http://screenshot.xfire.com/screenshot/nat...1c4c7d6bbba.png
As you can see, much more on the sides is visible when the game is actually fixed for wide screen and not just cropped using the properties line.
(screens are fannies)