The resolution of Call of Duty: Modern Warfare - Remastered (Call of Duty 4: Modern Warfare)

The problem is that I can't change the resolution. The game comes in, and you can play in windowed mode to full screen, but there is a default resolution of 2560x don't remember how, and can be changed only in full screen, but my monitor is not as healthy, so he does not pull a permit.
How to change it without entering the game?
PS About the commands in the label should not be written, it does not work almost always