Windows 8.1 build 9600.17415

Windows 8.1 build 9600.17415 is the official RTM build of Windows 8.1 Update 3 released on 19 November 2014. It was again planned that a Start Menu would be implemented and support for windowed Metro apps would be added, but only the Start menu was implemented for Windows RT on the Surface 1 and 2. The x86 implementation of this feature would appear in Windows 10 build 9780. This update was released for ARM32 devices on 1 September 2015. 