KB5075912 is a security update for Windows 10 ESU and LTSC 2021 that brings Chinese fonts up to GB18030‑2022A compliance. It fixes a bug where Secure Launch‑enabled PCs with Virtual Secure Mode would reboot instead of shutting down after recent updates. The patch also restores custom folder names hidden by desktop.ini files, improves stability for certain GPU configurations, and introduces targeted delivery of new Secure Boot certificates to only devices that have proven successful update behavior. These changes collectively smooth out several user annoyances while tightening the system’s security posture.

How KB5075912 Fixes the Hidden Quirks in Windows 10

KB5075912 rolls out to both Windows 10 Extended Security Updates (ESU) and Enterprise LTSC 2021, tightening security and correcting a handful of annoying bugs that slipped through earlier patches.

The Font Tweaks That Might Surprise You

The update brings Chinese fonts up to GB18030‑2022A compliance. For most users this is invisible, but the author noticed a subtle difference in how simplified characters rendered after the patch—nothing dramatic, yet a tidy fix for developers working with East Asian text.

Why Some PCs Keep Rebooting Instead of Shutting Down

One of the biggest complaints came from Secure Launch‑enabled machines using Virtual Secure Mode. After installing any security update released on or after January 13, 2026, those devices would restart rather than power off. The author saw this happen on a Lenovo ThinkPad that had just installed KB5075912 and was forced to reboot until the system finally shut down properly.

Custom Folder Names Come Back to Life

File Explorer used to ignore the LocalizedResourceName setting in desktop.ini files, meaning personalized folder labels disappeared after an update. The author has a habit of renaming the “Documents” folder to something quirky; KB5075912 restores those custom names so they show up again, keeping the desktop organized.

GPU Stability Gets a Boost

A few users reported crashes when switching between integrated and discrete graphics on certain laptops. The update patches an instability that affected specific GPU configurations, making video playback and gaming smoother.

Secure Boot Certificate Rollout Becomes Safer

Windows now uses targeting data in quality updates to decide which devices receive new Secure Boot certificates. Only those showing successful update behavior get the new keys, preventing a blanket rollout that could break legacy hardware. For IT admins managing large fleets, this phased approach reduces support tickets.

Putting It All Together

If you’re on Windows 10 ESU or LTSC 2021 and have seen any of these hiccups—fonts looking off, folders losing names, or your machine restarting instead of shutting down—install KB5075912. The changes are small but meaningful, and they patch the bugs that bothered both casual users and power‑savvy technicians.

February 10, 2026—KB5075912 (OS Builds 19045.6937 and 19044.6937)

February 10, 2026—KB5075912 (OS Builds 19045.6937 and 19044.6937) - Microsoft Support