Windows 8.1 build 9478

Windows 8.1 build 9478 is a build of Windows 8.1. It is known that this build exists in the ARM architecture. One screenshot was found on the Chinese website BetaWorld. Russian website PC Portal has also shown a screenshot with the build tag of this build. As of 2021, the build itself remains unleaked.

Confirmation of this build can be seen from a WinJS string, which originates from the Windows Store.