Yet to be released on PC, a Halo 3 listing has turned up in Steam's registry files - along with PC ports of Halo 2 and Halo Combat Evolved. While not a surefire sign these will make their way over to Valve's service in the near future, registry leaks have been reasonable for outing many titles in the past - Alan Wake being a prime example.
Over the past year, Microsoft has brought over a few games to Steam, including Fable III and Age of Empires III.
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