Perhaps I do not understand your question very well because I do not have a widescreen monitor. Maybe the best way to check for yourself is to run the ANW demo and fiddle with the screen resolution values to see if they are acceptable or not. Sorry, I am just not very good with hardware questions. I just play the game.
What version of the demo are you running? Is it this one?
ftp://ftp.matrixgames.com/pub/Harpoo...uge_Demo_1.exe
You can see what version is running by running the demo in Window mode. The version number will appear across the top window frame. i.e. 3.7.0.0 or 3.9.4.0