Windows 11 KB5083631 preview ships Xbox mode, hardened batch file execution

Microsoft pushed the KB5083631 optional preview to Windows 11 24H2 and 25H2, bumping builds to 26100.8328 and 26200.8328 with 34 non-security changes destined for May’s Patch Tuesday. The headline additions are a full-screen Xbox mode triggered via Win+F11 or the Game Bar, faster startup-app launching, and haptic feedback hooks for actions like window snapping and PowerPoint alignment.

On the security side, administrators can now opt into a hardened processing mode that blocks batch files and CMD scripts from being modified mid-execution — a defense against a long-standing TOCTOU class of attacks first previewed to Insiders in February. The update also expands device-targeting telemetry for the Secure Boot certificate rollover ahead of the June 2026 expiry of the original 2011 certificates, and improves Kerberos handling for Remote Desktop sessions using Remote Credential Guard.

Known issues include Windows Server 2025 systems with non-recommended BitLocker Group Policy configurations booting into recovery on first restart after install. The release follows an out-of-band fix earlier in April for the pulled KB5079391 preview, which failed with 0x80073712 errors.