KB5079473: This update improves File Explorer search reliability

March 10, 2026—KB5079473 (OS Builds 26200.8037 and 26100.8037)

Improvements
This security update contains fixes and quality improvements from KB5077181 (released February 10, 2026). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• [Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
• [File Explorer] Improved: This update improves File Explorer search reliability when searching across multiple drives or "This PC".
• [Windows Defender Application Control] Improved: This update improves how Windows Defender Application Control (WDAC) handles COM objects allowlisting policies. COM objects were blocked when the endpoint security policy was set higher than the allowlisting policy. With this update, COM objects are allowed as expected.​
• [Windows System Image Manager​​​​​​​] Improved: This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source. ​​​​​​​