After installing the Windows 11 April update: A mysterious folder appears on drive C for no reason

Content

Microsoft recently released the cumulative update KB5055523 for Windows 11, mainly fixing vulnerabilities and improving system performance.

However, many users found an empty folder named 'inetpub' in the root directory of the C drive after installing the update.

安装Windows 11四月更新后:C盘无故出现神秘文件夹

The "inetpub" folder is usually associated with Microsoft Internet Information Services (IIS), a website and service hosting platform developed by Microsoft.

By default, IIS is not enabled in Windows systems, and users need to manually enable it through the 'Turn Windows features on or off' dialog.

安装Windows 11四月更新后:C盘无故出现神秘文件夹

The inetpub folder is used by IIS to store website content, logs, and other server-related files, but after this update, this folder will be automatically created even if IIS is not enabled.

In actual testing, deleting this folder did not cause any issues with the use of the system, so this is likely a small bug inadvertently created by Microsoft.

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Summary
Microsoft recently released the cumulative update KB5055523 for Windows 11, aimed at fixing vulnerabilities and enhancing system performance. However, many users noticed an empty folder named 'inetpub' appearing in the root directory of the C drive after installing the update. This folder is typically associated with Microsoft's Internet Information Services (IIS), a platform for hosting websites and services, which is not enabled by default in Windows. Users must manually activate it through the 'Turn Windows features on or off' dialog. The 'inetpub' folder is used by IIS to store website content, logs, and other server-related files. Despite IIS not being enabled, the update automatically created this folder. Testing has shown that deleting the folder does not affect system functionality, suggesting it may be a minor bug inadvertently introduced by Microsoft.