Want to play Halo: CE, Halo 2 and Halo 3 on Steam? Well you can't. Tough luck sonny boy (or girl). While we originally reported on a Steam database app showcasing the Halo trilogy as possible entries for upcoming releases on Steam, turns out that one of our readers was correct in that it was probably just devkit tools, as Microsoft has denied that their prime-time blockbuster series for the Xbox was coming to Steam.
GameSpy ran an update on the news regarding a list of games that would be arriving on Steam thanks to a leak from the Steam database website. Microsoft responded to GameSpy's inquiry into the legitimacy of the Halo trilogy being made available on Steam, to which an MS rep stated...
“We currently do not have plans to release any 'Halo' titles on Steam."
They didn't say “PC” just Steam. It's still possible Microsoft could re-release Halo: Combat Evolved, Halo 2 and Halo 3 via Games For Windows Live marketplace or the Xbox Live Marketplace exclusively for Windows 8, presumably when the next-gen console launches, as a way to force-feed people their latest OS, which hasn't been sitting well with many hardcore PC users.
Still, let's not take away from this that the Steam database app is off it's game. Dyad designer Shawn McGrath did confirm via a YouTube video that the database app was correct and the game is coming to Steam.
As for why the Halo games are listed in the app, it could be a number of reasons and may have more to do with some behind-the-scenes development deals than possibly making the games available on Steam. I'll say this much, though, I would definitely buy the Halo trilogy on Steam if it had Workshop support and didn't force people to use Windows 8. The modding possibilities could be endless.