With big thanks to Racer_S ... :D ... 8)
He made this tool to remove the bars on the sides for TripleHead but it can also remove the bars from the top and bottom in widescreen ...
TripleHead info here ... http://www.widescreengamingforum.com/node/8818
The tool is DirectX 9 only at the moment ...
Download the tool from here ...
CLICK ME
Unzip the tool anywhere you like ... I'm using XP and mine is in the games main directory/folder ... C:Program FilesUbisoftAssassin's Creed ...
Run the tool ... leave it running ...
Set it as follows for 1920x1200 ... or your desired resolution
Choosing your version of the game ... mine is the UK shop bought version.
EDIT: This Aspect setting in the screenshot below should work for all 16:10 resolutions.
Follow the instructions on the front of the tool to adjust the aspect Ratio/FOV if you so desire as it will vary for different aspect ratios ... 4:3 ... 5:4 ... ... etc.
Just input the res you are using for other resolutions ... the other settings should stay the same.
Start the game ...
Press the * key on the number pad to enable the tool ...
If for any reason the graphics get messed up going from menu to in-game or back ... just disable the tool with the / key on the number pad and re enable it with the * key ...
That's it ... enjoy ... :D
Before ... 1920x1200 ...
After ...
The HUD does stretch a little with this tool enabled.
EDIT: I updated the settings screenshot due the findings of Punisher|ITA ... see his post/s below ...