Resolution Issue

Hi.

I play AoE II HD from steam. I understand that the game will automatically pick the max resolution available to my computer. My computer is 1920 x 1080 and works fine for all programs. However, HD is playing at like 1366 x 768.

This has just recently changed too. A few days ago the game was running at 1080. Now it's a much smaller res. It is impossible to play the game now because its too zoomed in.

Is there anyway to tamper with the files to force it to run at 1080 (WHAT ITS SUPPOSED TO DO ON A 1080 SCREEN).

Thanks