felixk4, this is a mission file. Go into this folder:
C:/Program Files:/ Codemasters:/ Operation Flashpoint:/ Users:/ (YOUR GUY):/ missions.
Then cut, and paste the folder: BWPP_WeaponsBuy_V1.Noe in there.
Then go into mission editor, in the game, in Nogova. Click "Load", then select the BWPP_WeaponsBuy_V1 mission, and click "Preview", this should show you how everything works. In the editor itself, you can see what he does to execute the menu.
Hope that helped!
~Mad Pup~
Oh and felixk4, There are a lot of servers for OFP out there, the community is growing as lonewolf said.
It is a 9 year old game, but still the best one out there.