KB5079391: [Application Control for Business] Improved

March 26, 2026—KB5079391 (OS Builds 26200.8116 and 26100.8116) Preview

Highlights
This update is available through two release phases: gradual rollout and normal rollout. A gradual rollout delivers an update in phases, so features reach devices over time instead of all at once, meaning availability varies by device.​​​​​​ A normal rollout is the broad release to all eligible devices at the same time, usually when it reaches general availability (GA).

Normal rollout
This non-security update includes quality improvements. The following summary outlines key issues addressed by the KB update after you install it. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• [Application Control for Business] Improved: This update improves Application ID tagging in Application Control for Business policies. With this update, the system identifies which apps should receive tags more accurately and behaves more reliably.
• [Narrator] This update improves the Natural Voices experience in Narrator. It also makes Natural Voices setup more reliable.
• [Performance & Reliability] This update improves stability in Windows Recovery Environment (Windows RE) when you run x64 apps on ARM64 devices. These apps run more smoothly and respond as expected.
• [Windows Update Deployment (known issue)] Fixed: This update addresses an issue in Windows 11, version 25H2, where updates installed using the Windows Update Standalone Installer (WUSA) might fail with error code ERROR_BAD_PATHNAME. This issue can occur when you double-click a .msu file or run WUSA from a network share that contains multiple .msu files.