Windows 10 build 9903

Windows 10 build 9903 is a build of Windows 10, which was shared online on 29 January 2015.

File Explorer

 * Home page has been renamed to Quick Access and it is expanded in the navigation tree by default.
 * Favorites page is now hidden in the navigation tree.

Volume tray

 * The volume icon is now thinner and flatter in appearance.

XAML Start menu
To enable the hidden start menu introduced in build 9900. Go to the following registry key:, create a DWORD value and name it   and set its value to 1, then log out and log in back.

UEFI BIOS
This build can only be installed on machines utilizing UEFI firmware since it hangs on a BIOS system.

Window thumbnail border color error
If window auto-colorization is enabled, the window thumbnail borders on the taskbar do not change color even after the wallpaper changes. This issue can be remedied by manually changing the window color through the Control Panel or restarting Windows.