Hey, thanks for the guide, but this isn't working for me either. Help would be appreciated. I'm using the steam version of Arma, and got about here: 1. Go to your vanilla ArmA 2 directory (NOT OA). 2. Copy your AddOns folder. (addons on Arma 2, I assume) 3. Go to your OA folder. 4. Paste the AddOns folder. (pasted the folder into OA w/o changing anything) 5. Open up whatever you use to launch it. (steam) 6. In the Target line (assuming this means the Launch Options in Steam), you must have "\Expansion\beta\arma2oa.exe" -mod=@DayZ;pmc;Expansion;Expansion\beta;Expansion\beta\expansion; <- (this doesn't work for me atm) 7. Launch the game. (error: Direct3D 9 engine failed to generate) What am I doing wrong? A 100 player server sounds great. EDIT: Fighter helped me out, thanks dude!