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For some mysterious reasons the in-game settings the possibilities of changing the resolution are rather limited. You can mitigate that problem by editing two values in the Windows registry.

Open the registry editor (WIN+R, enter regedit)

Go to the key:


Now you can change the values for

Screenmanager Resolution Height_h2627697771


Screenmanager Resolution Width_h182942802

to the resolution you want to use.