It seems after I click "ok" on the video options screen the game has to restart but did it in fullscreen even though I had applied windowed mode. I then reset it to windowed mode and clicked "ok" again but this time it gave me a resizable window and didn't make me reboot. After doing something else in another area of the main menu I had to restart the game again, and it went right back to fullscreen. Is there any way I can have a shortcut for DayZ that I can add target commands to, or a .cfg I can edit, so the game is forced to start in windowed 1440x900 mode?