Details just now coming from a developer session at Microsoft's Build conference last week have raised major concerns about the legality of the Windows Store. While it was already known the company would likely take a 30 percent cut for paid apps using Windows 8's Metro interface, Windows Store director Ted Dworkin is now known to have also told the audience that developers will be banned from offering Metro-optimized apps outside of the store. Apps written using classic Windows programming, including ones optimized for touch, wouldn't be subject to the same rules.