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Haven't had time to play this yet but I did run it to check video settings and I use Ultrawide 3440x1440 and I can select that res in both fullscreen and window mode (although you need to run the BG app to remove window borders as it has not borderless option). I ran it briefly on that res and seems to work fine. Also, didn't crash, at least not yet.
In short: 3440x1440 works!
In short: 3440x1440 works!