Microsoft has released cumulative update KB5121109 (Build 28120.2738) for Windows 11 version 26H1, intended for insiders on the Experimental channel. This release includes the removal of the legacy WMIC utility, the rollback of the Drag Tray feature based on user feedback, as well as several important fixes aimed at improving system stability and accessibility.
- WMIC removal. The Windows Management Instrumentation Command-line (WMIC) utility has been removed from this release. The change is part of the gradual deprecation of WMIC and its complete removal from Windows.
- Drag Tray. Based on feedback from Windows Insider Program participants, Microsoft has removed the Drag Tray feature from this build. The company continues to work on improvements in this area and promises to announce a future replacement in one of the upcoming updates.
- Settings. Fixed an issue introduced in the previous build where Settings crashed when interacting with System > Notifications.
- Accessibility. Fixed an issue from the previous build where Magnifier failed to launch for some Insider Program participants.
Known issues:
- Known compatibility issue with PUBG: BATTLEGROUNDS. Due to a known compatibility issue with PUBG: BATTLEGROUNDS, the game may fail to launch after installing this build. The restriction is intentionally applied to avoid stability problems while Microsoft works on a fix together with the game developer. The company promises to share details and a resolution timeline later.
To install update KB5121109 (Build 28120.2738), go to Settings > Windows Update and click Check for updates. A system restart is required to complete the installation.
| Feature / Change | Performance Impact | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|
| WMIC removal | 🟢 Slight improvement (less legacy overhead) | 🟢 System cleanup, smaller attack surface | 🟡 Minimal (rarely used by consumers) | ⚪ No direct impact |
| Drag Tray removal | 🟡 Neutral (feature removed) | 🟢 Reduced background code | 🟡 Minimal | ⚪ No impact |
| Settings crash fix (System > Notifications) | 🟢 Improved stability | 🟡 Minor resource optimization | 🟢 Slightly faster UI response | ⚪ No direct impact |
| Magnifier launch fix | 🟢 Improved responsiveness | 🟡 Minor | 🟡 Minimal | ⚪ No impact |
| PUBG compatibility issue (known) | 🔴 Temporary performance loss for affected users | 🔴 Blocked until fix | 🔴 Game may not launch | 🔴 Severe (PUBG unavailable) |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5127757 | 28120.3181 | 26H1 | Windows 11 | Experimental | 2026-10-07 |
| KB5127758 | 26220.9606 | 25H2 | Windows 11 | Beta | 2026-10-07 |
| KB5127754 | 28020.3172 | 26H1 | Windows 11 | Beta | 2026-10-07 |
| KB5127753 | 26340.9616 | 26H2 | Windows 11 | Experimental | 2026-10-07 |
| KB5124192 | 28120.3151 | 26H1 | Windows 11 | Experimental | 2026-10-02 |
| KB5124196 | 28020.3142 | 26H1 | Windows 11 | Beta | 2026-10-02 |
| KB5124197 | 26220.9587 | 25H2 | Windows 11 | Beta | 2026-10-02 |
| KB5124193 | 26340.9596 | 26H2 | Windows 11 | Experimental | 2026-10-02 |
| KB5124166 | 26220.9568 | 25H2 | Windows 11 | Beta | 2026-09-25 |
| KB5124163 | 28020.3112 | 26H1 | Windows 11 | Beta | 2026-09-25 |