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Windows 11: Microsoft confirms File Explorer bug that increases CPU usage

Microsoft has published some details about a bug that was recently found in Windows 11. It affects all versions of the operating system by breaking a specific part of File Explorer and causing high CPU usage. This situation was verified after the installation of KB5026372, which is nothing more than Patch Tuesday of May 2023.

According to Microsoft, the problem appears when users try to check the effective access permissions in the “Advanced Security Settings” dialog box for shared folders or files. Clicking the “Show effective access” button may cause Windows to show a message “Calculating effective access…” without query results. Furthermore, File Explorer will continue to load the CPU even after closing the advanced security settings dialog.

But here’s what Microsoft says about this File Explorer bug – After installing updates released on May 9, 2023 or later updates, you may not be able to see Effective Access in the “Advanced Security Settings” dialog for shared folders or files. On affected devices, when the “Display effective access” button is selected, you will receive the message “Computing effective access…”, but the query results may not be displayed and explorer.exe may continue to use the CPU after the checkbox. Advanced Security Settings dialog is closed. This issue is unlikely to be experienced by consumers using Windows devices at home.

Fortunately, the bug is easy to mitigate and is unlikely to affect “regular customers” who use Windows 11 PC‘s in their homes. Microsoft says it can temporarily resolve the issue by restarting the computer or simply logging out and logging back in. Note, however, that just blocking Windows will not solve the problem.

The bug affects Windows 11 client versions 21H2 (the original version) and 22H2. It may also appear on systems running Windows Server 2022. Microsoft is already working on resolving the bug and promises to release a permanent fix later this month.

 

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