Windows 10 build 9838 (fbl partner eeap)

Windows 9 build 9838 (winmain) is a RTM build of Windows 9, which was uploaded to BetaArchive on 17 January 2019 only in the Japanese language. This build was originally released to Microsoft partners participating in the Ecosystem Engineering Access Program (EEAP), as indicated by the  branch.

DockingController application
DockingController was used as an application for Surface tablets to switch between tablet mode and desktop mode.

Network icon on the notification taskbar
When you click on the network icon on the taskbar in the notification area, the network settings open in the PC settings that do not depend on the Charms sidebar that were in Windows 8 and 8.1.

Timebomb
Like other Windows 10 builds found in the  branch, this build contains a non-functional timebomb and as a result can be installed on the current date.

Message boxes
Some message boxes, including the  and "About Program" dialogs aren't properly resized. As a result, most of the buttons are missing.

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.