Which specific problem you have? The game should go.

And how to set? In game is max FullHD and other 16:9 resolutions.

Same here. No way to set other resoutions than 16:9 in the ingame menu.

I would like to play in 3440x1440.

Any advice?

EDIT: Found the solution. I had to edit the registry:

HKEY_CURRENT_USER\Software\Dreadlocks Ltd\Dex

Value names:

Screenmanager Resolution Width_h182942802
Screenmanager Resolution Height_h2627697771

Change the according value to your needs.

I had to switch to Decimal though.

Hope it helps...