Games on Demand, a.k.a. full game downloads, is one of the more recent additions to Xbox Live -- and today Microsoft has announced that it's bringing the service to its Games For Windows Live platform beginning December 15. GFWL creative director Chuck Osieja calls the initiative "Microsoft's return to delivering Windows games built on unique LIVE experiences." The service has a rocky history of sporadic supported releases and last summer ditched its subscription fees in the face of competition from the likes of Steam.

The move puts Microsoft up against Valve's digi-distribution service, which similarly offers community features and its own Achievements system, but boasts a much larger catalog at present. The GFWL Games on Demand initial lineup will include Resident Evil 5, Red Faction: Guerrilla and Battlestations Pacific along with new GFWL-enabled versions of 2D Boy's excellent World of Goo and Hemisphere Games' Osmos -- all titles currently offered by Steam, with some available via Stardock's Impulse service. Microsoft hasn't divulged pricing for titles offered via GFWL Games on Demand.

A reworked version of the former Windows Vista Ultimate Extra Tinker will be made available free to GFWL users when the Games on Demand service launches a week from next Tuesday.

This article was originally published on Joystiq.