Thread: ARMA 2: CO (how to combine ARMA 2 into ARMA 2:OA and use together)

Post here all stuff that you think could help :)

I have boxed Arma2 and Sprocket version of OA and all I had to do was update Arma2 to latest version before combine games, but i guess Steam is a different story. Anyway here is few links that i found:

Bohemia Interactive Forums - View Single Post - ARMA 2: CO (how to combine ARMA 2 into ARMA 2:OA and use together)

Bohemia Interactive Forums - View Single Post - ARMA2 & OA's Steam Thread: All Steam Q's/discussions go here [covered by Dwarden]

adding onto this beast :)

The problem is the start up line is loaded for each instance of the game separately. Meaning, if you right click and make a custom startup line for ARMA2, those launch options are for ARMA2. The same is true for ARMA2 OA, but if you "Launch Combined Operations" you load a separate file altogether.

When STEAM released OA they realized very quickly that there was not a "Launch Combined Operations" option to those that purchased the stand alone version of OA. They put out a patch which adds a file to your OA root directory called "_runA2CO.cmd". This file is nothing more than a launcher that was created by utilizing the mlink feature of your OS in conjunction with the registry path values for ARMA2 and ARMA2 OA's.

That brings us to the question "So how do I load mods with ARMA2 OA Combined Operations?"
Answer, we need to modify the "_runA2CO.cmd" file.

1). To edit the file: go to your Arrowhead folder, and make a copy of your "_runA2CO.cmd" and rename the copied .cmd file to i.e. _runA2CO_ACE.cmd.
2). Right-click on the batch file and choose "Edit".
3). Look for these lines at the end of the batch file:
:runs
"%_STEAMPATH%\steam.exe" -applaunch 33930 "-mod=%_ARMA2PATH%;EXPANSION;ca"

and change them to:

:runs
"%_STEAMPATH%\steam.exe" -applaunch 33930 "-mod=%_ARMA2PATH%;EXPANSION;ca;@cba;@ACE;@ACEX;@ACE X_SM"

Or any other @MODS you require. Be sure to follow the format listed which is "-mod = @MOD1;@MOD2;@MOD3;"
DONE!