Hi, my friends. Jan the Wit thinks he has the solution. We are gonna copy and paste his tips:
The problem is that you cant't start the winsetup.exe and set the mode/resolution in the map ?:\SteamLibrary\SteamApps\common\SymplokeSteam\
Copy and Rename the symploke1.exe to symploke_English.exe and you can use the winsetup.exe to set your settings !!
set both symploke1.exe and symploke_English.exe in the map to start the game in steam or in de map.
ːsteamhappyː