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ValveTime.co.uk | Valve News, Forums, Steam
Restart your steam clients, kids! 64-bit HL2 & Lost Coast have been released!
(Will only change to 64-bit if you are running a 64-bit Operating System. In other words, you don't get it if you have regular Windows XP. This is only for Windows XP 64-bit which you would KNOW if you have it!)