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This is an official trailer for Half-Life Platinum:A collection consisting of Half-Life, Counter-Strike, Team Fortess Classic, and Half-Life:Opposing Force. This video isn't by me nor do I take credit for it, This video was made by Valve Software and came off of Fileplanet.com to archive it here.
Those looking to view the trailer, Drag the video to your PC desktop and run using whatever video player is on your Desktop.