Windows 10 build 9903

Windows 10 build 9903 is a build of Windows 10 leaked on 29th of January 2015.

File Explorer
The Home page has been renamed to Quick access and it is expanded in the default navigation. The Favorites page was also hidden in the navigation.

Sound
The volume icon has been changed to a thinner and flatter look in appearance.

UEFI BIOS
This build has to be installed on an UEFI BIOS, otherwise it will hang booting setup.

Window thumbnail color error
Window thumbnails on the taskbar do not change color, but the user can change it after the computer restarts.