Windows 10 build 9907 (fbl ie)

Windows 10 build 9907 (fbl_ie) is a build of Windows 10.

The build is only available in the  pseudo-locale, an automatically generated localization based on regular English translations but modified to test internationalization capabilities. These modifications include the addition of a five-character prefix identifying each localization string, replacement of standard Latin characters with ones with diacritics or similarly looking characters from other writing systems, or the extension of certain strings' length by adding exclamation marks to the end.

Timebomb
This build uses a test-signed certificate and as a result can be installed on the current date. However, installing this build on the current date disables the ability to change the desktop wallpaper in the Control Panel.

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

Task preview border color
If window auto-colorization is enabled, the task preview borders 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 by restarting Windows.

Metro apps
All Metro apps except Settings and Store (Windows 8.1) won't work after the installation.