I did,F:\Arma2\Bohemia Interactive\arma2oa.exe" -mod=@DayZ I was looking around and found this, maybe this will help you. COMMON ERRORS: I get 'You cannot play/edit this mission, it is dependent on downloadable content that has been deleted.dayz_code, dayz_weapons, dayz_equip etc.'upon joining any DayZ server. - You installed the mod or the shortcut incorrectly. Make sure you add "-mod=@dayz" without quotes in the launch options and DayZ mod files are installed in the proper folder. By default: "C:\Program Files (x86)\Steam\steamapps\common\arma 2 operation arrowhead\@DayZ\Addons I got mine working... I forgot to add the Addons folder :D Silly me, I hope you've done a silly mistake so you can start playing.