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There currently is no way of changing the game resolution like in EU3 or DV ...

We can hope that maybe Johan has included this option in the 1.2 patch for Arma.

However i am not holding my breath on that as the resolution changing capabilities have only been introduced in new products or expansions. This change would require a change to the executable of the program something that you usually try and avoid when doing a patch to a game.

Corey