Baseline (Widescreen) Solution & Issues
Retail Version: Only 4:3 resolutions are available - a Hex edit is necessary for HOR+
Go to your Game root folder and open Ace in Action.exe in a hex editor.
Look for AB AA AA 3F and change it to CD CC CC 3F (for 16:10) or 39 8E E3 3F (for 16:9).
Now open Launcher.exe and look for 1280x1024 (as text) and change it to your resolution for example 2560x1440.
Start the Game and select 1280x1024 in the Game Launcher.
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Steam Version: First you need to unpack the EXE Files with the Tool: Steamless
Second ist the same hex edit method like in Retail Version described.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Same solution as in Widescreen.
Go to your Game root folder and open Ace in Action.exe in a hex editor.
Look for AB AA AA 3F and change it to 60 E5 18 40 (for 21:9).
Now open Launcher.exe and look for 1280x1024 (as text) and change it to your resolution for example 3440x1440.
Eyefinity / Surround Specific Solution & Issues
Same solution as in Widescreen.
Go to your Game root folder and open Ace in Action.exe in a hex editor.
Look for AB AA AA 3F and change it to AB AA AA 40 (for 48:9).
Now open Launcher.exe and look for 1280x1024 (as text) and change it to your resolution for example 5760x1080.
4k UHD Specific Solution & Issues
Same solution as in Widescreen.