To change the resolution, open f1graphics.cfg in the main GP4 folder and use notepad to change in the lines.
You also need to set the first line "; f1graphics.cfg controls all settings (default 0)" to 1 instead of 0.
Also, in my experience, GP4 does not run properly on older PCs when you put the resolution on higher than your current moniter. I've never gotten that to work.
My old PC was 1600x900, so GP4 did not work higher than that. My new PC has 1920x1080p, and GP4 does not work higher than that. Don't know if it's a problem only I have, someone can maybe
comfirm it to be true or untrue
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Ice Hockey is my Religion!