An anonymous reader quotes a report from Liliputing: First announced last year, Microsoft provided an update on Windows 10 ARM at the MS Build developer conference today. And the company confirmed that not only would Windows 10 ARM be able to run legacy apps developed for computers with x86 processors but you'd be able to just download any old Win32 app from the internet, install it, and run it on a computer running Windows 10 ARM. In other words, Windows 10 S runs on devices with ARM or x86 processors, but only supports Windows Store apps. Windows 10 ARM only runs on devices with ARM chips... but supports apps from pretty much any source. Developers don't need to convert their software in any way, because Windows 10 ARM includes a built-in emulation layer that allows Win32 apps to run on an ARM-powered system. But Microsoft demonstrated how you could download a common program like 7zip from the internet and simply install it on a device with a Qualcomm Snapdragon 835 processor. Of course, developers can also package software optimized for ARM as Universal Windows Platform apps for distribution in the Windows Store. But they don't necessarily have to.