Windows 8 build 7878

Windows 8 build 7878 is a pre-Milestone 2 build of Windows 8. Images of this build were leaked in a folder included with the leak of Windows 8 build 7746 on 2020-05-03.

This build already showcases significant evolution from 7875. The M2 metro OOBE has been introduced, as well as the new AutoPlay (although it is simply a height change at this point) and the Metro Dock. It also has a new login screen unlike any other build.

Finally, similarly to Windows 8 build 7867, it uses the Arial font for the title bar and watermark.