I DISCOVER THAT HALF LIFE IS A VIDEO GAME BUT I ACTUALLY WANNA KNOW WHAT HALF LIFE IS IT A GAME THAT LET YOU PLAY OTHER GAMES IN THE MAIN MENU OR DO YOU HAVE TO TAKE THE FILES OF THE GAME AND THEN PUT THE FILES OF THE ESF I WILL REALLY APPRECIATE IF SOMEONE COULD HELP ME WITH THAT IM A NEWBIE ON THIS CRAP SO PLEASE HELP ME SO I CAN PLAY THIS TOTAL AWESOME GAME!!!!!!