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How to install and launch addons with the Steam version
How to install and activate addons and mods with the Steam version is a little different than with the normal retail version which is decribed here.
Norsu from the FDF Mod wrote a guide how to install and activate the FDF Mod with the Steam version and allowed us to copy it to our FAQ. The written procedure below is for the FDF Mod but can be used for other mods and addons as well.
Many thanks go to the FDF Mod Team for allowing us to place the guide here!

1. Make sure you can run Arma 2: Combined Operations through Steam. For instructions on how to combine Arma 2 and Arma 2: Operation Arrowhead prefer to this thread:

2. Run the ArmA2_FDFmod.exe (it will take a while to load)

3. Proceed by clicking Accept

4. Select your ARMA 2: Operation Arrowhead Steam folder using Browse. It is important that you install FDFmod into right folder. The default ARMA 2: Operation Arrowhead Steam folder is C:\Program Files x86\Steam\steamapps\common\arma 2 operation arrowhead\ but this will wary depending on where you have installed Steam.

5. Click Install and wait for the installer to extract all files. FDFmod readme will open when installation is complete. Readme can be found in your ARMA 2: Operation Arrowhead Steam folder.

6. Find ARMA 2: Operation Arrowhead in your Steam games list. Right click on it and select Properties.

7. In Properties window select SET LAUNCH OPTIONS…

8. In Launch Options window you will see an empty text field. Write “-mod=FDFmod” to this field (with quotes) and click OK.

9. Right click on ARMA 2: Operation Arrowhead in Steam games list and select Launch ARMA 2: Combined Operations.

10. ARMA 2: Combined Operations will now start with FDFmod.


Here is a video explaining how to install addons and mods when there is no installer (exe file) by Rallen.

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Updated: Monday 06th of May 2013 03:48 PM,  Asked By: Foxhound,  viewed 333313 times