Microsoft has amended the guidelines of the Windows Store in Windows 8 to allow the sale of games rated M for Mature in the U.S. and PEGI 18 in Europe in December. Also, Windows’ corporate VP of web services Antoine Leblond assured developers that there will be means to sell games outside of the Windows Store.

“This is to give developers a heads up that that’s where we’re going,” Leblond said, “So they can have the peace of mind around developing the kinds of games that will have those ratings.”

“We want the world of desktop apps to to keep existing [outside of the Windows Store],” he added. “There’s no reason to get in the way of that. Valve can keep being Valve.”