Baseline (Widescreen) Solution & Issues
The game only supports 4:3 resolutions - you need to Hexedit your Savegame file to get it HOR+
Run the Game and change the resolution to 800x600, start a new Game and then quit.
Now go to --> C:\Users\Public\Documents\Ghost Master\SaveGames\2500433375.opt (the number is different but it is the second .opt file) and open it in a hex editor.
Look for 20 03 00 00 58 02 and change it to 00 0A 00 00 A0 05 (2560x1440), that's it. See here for other resolutions.
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There are some solutions on the net where you can simply edit the SpDrv.cfg but it never worked for me.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Same as in Widescreen:
Go to --> C:\Users\Public\Documents\Ghost Master\SaveGames\2500433375.opt (the number is different but it is the second .opt file) and open it in a hex editor.
Look for 20 03 00 00 58 02 and change it to 70 0D 00 00 A0 05 (3440x1440)
Eyefinity / Surround Specific Solution & Issues
Same as in Widescreen:
Go to --> C:\Users\Public\Documents\Ghost Master\SaveGames\2500433375.opt (the number is different but it is the second .opt file) and open it in a hex editor.
Look for 20 03 00 00 58 02 and change it to 80 16 00 00 38 04 (5760x1080)
4k UHD Specific Solution & Issues
Same as in Widescreen:
Go to --> C:\Users\Public\Documents\Ghost Master\SaveGames\2500433375.opt (the number is different but it is the second .opt file) and open it in a hex editor.
Look for 20 03 00 00 58 02 and change it to 00 0F 00 00 70 08 (3840x2160)