go to http://www.arma2.com/beta-patch.php download, install go to your operation arrowhead directory inside your steam directory there you have _runA2CO_beta , rightclick edit - search for run: call "%_ARMA2OAPATH%\Expansion\beta\ARMA2OA.exe" "-mod=%_ARMA2PATH%;EXPANSION;ca" add "-mod=@DayZ" in between those 2 entries save, and start with the file you just edited ??? profit I do run it this way atm, but would like to run it via steam instead. I tried the 'copying the .exe from the beta folder over the main folder, then pasting the command line in steam launch properties. But, then I get a crash. I've seen it doesn't work from some people. any ideas.