GoKawiilMicrosoft has released the KB5083631 optional cumulative update for Windows 11, which includes 34 changes, such as a new Xbox mode for Windows PCs, enhanced security and performance for batch files, and performance improvements for launching startup apps.
KB5083631 is a preview update that lets admins test Windows bug fixes, improvements, and new features, before they're generally available during next month's Patch Tuesday release. However, unlike cumulative updates, monthly optional updates do not include security fixes and only roll out quality improvements.
With the April 2026 optional update, Microsoft has improved the performance of launching apps listed under Settings > Apps > Startup when the device starts.
It also added a new Xbox mode for Windows 11 PCs (e.g., laptops, desktops, and tablets), which provides a full‑screen interface that puts games front and center while minimizing background distractions. Users can enter Xbox mode from the Xbox app, Game Bar settings, or by using the Windows logo key + F11 keyboard shortcut.
Additionally, this month's preview update introduces improved security and performance for batch files and CMD scripts, a change that first rolled out in February to Windows 11 Insiders in the Beta and Dev channels.
"Starting with this release, administrators can enable a more secure processing mode for batch files. This mode prevents batch files from changing during execution," Microsoft explained.
You can install KB5083631 by opening Windows Settings, clicking on Windows Update, and then on 'Check for Updates.' However, since this is an optional update, you will need to click the 'Download and install' link if you don't want to install it manually from the Microsoft Update Catalog.
KB5083631 preview update (BleepingComputer)
KB5083631 update highlights
Once installed, this optional non-security update will update Windows 11 24H2 and 25H2 devices to builds 26100.8328 and 26200.8328, respectively.
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