the game show off (Tom Clancy's H.A.W.X. 2)

Next, try to put 800x600 resolution, but in games from yubisoft there is 1 problem in all the game is almost always black bars appear on top and bottom, and so you have to find a resolution soon that would be 16x9 and in General it 856х480, all the other games accept it and are fine, but this game refuses to change resolution and puts a gun 800x600. How to stretch what I can add or change the config of the game