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Read This !!!! http://www.armaholic.com/ download AddOns/mods 1. Download your addon 2. Extract the addon into a (@xxx) Folder ( Yes it has to be a @ before the name) 3. make sure the .pbo files is in an addon folder 4. right click on Arma 2 operation arrowhead then go to properties and set launch options. 5. type (@xxx) 6. start Arma 2 Combined Operations 7. when your in the menu you will see (@xxx) to the right it will be in the expansions too. Remember This will only work on Arma 2 Combined Operations so if you launch the old arma 2 or arrowhead alone the mod wont be in the game. there is an other way so you can have more addons, the steam start options can only use 50 letters. add your addons in your documents/arma2 then you go in and launch steam/steamapps/common/arma2 operation arrowhead/arma2oa.exe then go to expansions and (enable) those addons you want :D have fun! xD leave comments :D