I started a game at first it did not work, could not even see all screen.
then (with one mans help) i fixed it. Changed scale and layout from 125% to 100%. And now at least i can see all text. But still i can not play in 1600x1200 it sticks to 1024x768 on options menu Display. On my pc resolution is 1920x1080.
After that, you're going to need to find out which save file you are currently going to be playing with. If you haven't created a save game yet, create one.
If you have multiple save files and you can't figure out which one you need, drag the .opt file of the save game into HxD. The numbers in the file name will be the same between the .sav files and .opt so you need which ones are linked.
I.E. 3539197235.sav is with 3539197235.opt
Keep going through each one and look at the Decoded text on the right-hand side. Look right at the top and you should see some text, your save file name.
Once you found your file, you're going to need to edit some specific values to your resolution.
Watch this video I put together, it'll show you what you need to do, it's easy. Link
After that your game should work in the resolution you want, I've also found that all future save files will automatically edit themselves to run at your resolution.