Windows 10X build 21319

Windows 10X build 21319 is a build of Windows 10X. A screenshot of the build being installed via Windows Update was posted to the BetaWiki Discord server on 25 September 2021.

This build is currently the only known build of Windows 10X that used the Cobalt semester as its base unlike previous Public Preview builds, which used the Manganese or Iron semesters.