OK - I'm the dummy

I downloaded the file "armyops230-linux.run". It is suposed to be the "Special forces V2.3.0 Full install/server for Linux"

I want to play the game - heard it was very good - now that I've got it, how do I "run" it? Click on the file and Kate will display what's inside, but that does me no good. Do I need to go to apt-get to install it? Does it run directly off the file I downloaded? Do I need more/another files?

HELP Please!?

GMD