KB5055528: Update for the Aysen region in Chile

April 8, 2025—KB5055528 (OS Builds 22621.5189 and 22631.5189)
Highlights
This update addresses security issues for your Windows operating system. ​​​​​​​

• [Daylight Saving Time (DST)] Update for the Aysen region in Chile to support the government DST change order in 2025. For more info about DST changes, see the Daylight Saving Time & Time Zone Blog.
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• [OS Security] After installing this update or a later Windows update, a new %systemdrive%\\\\inetpub folder will be created on your device. This folder should not be deleted regardless of whether Internet Information Services (IIS) is enabled on the target device. This behavior is part of changes that increase protection and does not require any action from IT admins and end users. For more information, see CVE-2025-21204.

​​​​​​​Improvements​​​​​​​

• This update makes miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.