I have bought ArmA2 and Operation Arrowhead off Steam. BIS have kindly been trying to fix the issue with combining the 2 games into Combined Operations with batch files but for a player like me who likes to use mods and addons it can be a bit of hazzle to edit and create different batch files to fit my need for different mod strings.
In my gaming group we were used to run our custom modsets for ArmA2 through Yoma Addon Sync (thank you for this very nice tool, Yoma ) and some of us were sad not being able to run Combined Operations with mods/addons as we were used to.
However, I think I've found a solution. This setup works for any server you wish to join through Yoma.
First make sure that you're running the latest version of Yoma Addon Sync and that it is pointing to your ArmA2OA.exe in the OA exe field under settings.
Now, in Yoma go to the Launch Game tab and select Advanced on the tab to right under the Server Info window. Put this into the Custom arguments field:
"-mod=C:\Program Files (x86)\Steam\steamapps\common\arma 2;Expansion;ca"
Adjust directories to point to where your ArmA2 and Operation Arrowhead folders are located.
Remember to put a " at the beginning and at the end of the string. See screenshot of where to put in this custom mod string in Yoma if necessary.
How to run Combined Ops. with a beta build through Yoma:
First, point to your OA beta.exe in the "OA exe" field on the settings page in Yoma Addon Sync:
C:\Program Files (x86)\Steam\steamapps\common\arma 2 operation arrowhead\Expansion\beta\arma2oa.exe
Adjust directory to point to where your Operation Arrowhead beta.exe is located
Edit the Custom Arguments field to read this:
"-mod=C:\Program Files (x86)\Steam\steamapps\common\arma 2;ca;Expansion;Expansion\beta;Expansion\beta\Expan sion" (without an extra space in the last mentioned "Expansion" word!)
Adjust directory to point to where your ArmA2 folder is located
Remember to put a " at the beginning and at the end of the string.
For both setups, Combined Ops and Combined Ops+Beta build, you can tick "No splash", "World=empty" etc. on the basic launch options tab and create mod sets using the "Add modset" button as you see fit.
When downloading addons they should all be placed into your Operation Arrowhead folder.
Voila! Now you can create and load any modsets on the Launch Game tab as normal in Combined Ops mode through Yoma Addon Sync.
Feel free to leave any feedback..