How can I play in windowed mode using the Steam version

[tess622 0]

I have Arma 2 and Arma 2: Operation Arrowhead downloaded on Steam but the only way to play this mod is if I launch Arma 2: Combined Operations. It wont work if I select "launch in windows mode". Every time I try that and try to get into a game it says "Can't connect due downloadable content that has been deleted ".chenarus".

So my question is...is there any way to get this game playable in windowed mode?

[Legacy (DayZ) 1091]

Alt Enter?

Ever consider checking the video settings?

Edit: C:\Users\\Documents\ArmA 2

ArmA2OA.cfg

Edit windowed to 1