KB5089414

Microsoft has released cumulative update KB5089414 (26300.8376) for Windows 11 version 25H2 for Insiders on the Dev Channel. This is an experimental Windows 11 Insider Experimental Preview Build 26300.8376, distributed to participants in the Windows Insider Program on the Experimental Channel. The update includes new features, improvements, and fixes, many of which are being tested through Controlled Feature Rollout technology.

• Touchpad: scroll speed and zoom adjustment. Microsoft is adding new gesture control capabilities for precision touchpads in the Settings section. The features will be widely available in most applications, except for WinUI 3-based interfaces — full support requires new versions of WinAppSDK (1.8 and 2.0), with necessary changes in development. Added basic gesture speed settings for scrolling and zooming.
• Touchpad: auto-scroll. Scrolling continues without needing to lift your fingers from the touchpad. Activated in two ways: move your fingers to the edge of the touchpad while scrolling, or hold them still with firmer pressure (requires hardware support).
• Touchpad: accelerated scrolling. Repeated scrolling increases speed, making it easier to quickly navigate through long documents.
• Touchpad: one-finger scrolling. Vertical scrolling with one finger, initiated from the left or right edge of the touchpad. Touchpad updates include auto-scroll, gesture speed adjustment, accelerated scrolling, and optional one-finger scrolling support.
• File Explorer: address bar accepts paths with double backslashes and quotes. For example, C:\Users\user or "C:\Users\user". This expands compatibility with different input formats. Also improved the reliability of the address bar suggestion dropdown — it now closes stably after selecting an item.
• File Explorer: convenient file size format. In Details view, file sizes are now displayed in appropriate units (KB, MB, GB), rather than only in kilobytes. This makes them easier to understand at a glance.
• File Explorer: file renaming improvements. Fixed an error where text would be reselected when renaming items in folder views. Also fixed an issue where updated file names (if only character case was changed) would not immediately appear in folder views — both for local and cloud storage. Improved keyboard navigation in File Explorer context menus displayed in popup windows. Feedback: send feedback through Feedback Hub (Win + F) under Files, Folders, and Online Storage > File Explorer.
• Education: free upgrade to Windows 11 Pro Education for K–12 schools. Windows Insider participants in K–12 school institutions receive a free upgrade from Windows 11 Home to Windows 11 Pro Education. This allows educational institutions to purchase devices with Windows 11 Home, upgrade them to Pro Education, and connect them to school management. Upgrade procedure: log into the device with a local account, launch Command Prompt as administrator and run the Clipupgrade.exe command, log in with a K–12 school organization account to verify upgrade eligibility. The device will prepare the update and complete installation after reboot. Important: the upgrade works only one way. Reverting to Windows 11 Home is only possible through a clean OS reinstall. Feedback: send feedback through Feedback Hub (Win + F) under Windows Setup.
• Administrator Protection. Improved reliability of the Japanese IME editor when Administrator Protection is enabled.
• Fix: WPN (Windows Push Notifications) service. Fixed a hang in the WPN service that caused notification issues and some applications to freeze on startup in previous builds.
• Improvement: shortcut icon loading. Improved reliability of loading shortcut icons on the desktop.

Updates are distributed based on Windows 11 version 25H2 via a feature enablement package (build 26300.8346). Many features are distributed using Controlled Feature Rollout technology. They first become available to a small group of Insiders, and then their availability expands as feedback is received and analyzed, to evaluate how they are perceived before becoming available to all participants in this channel.

Windows Insider participants who want to receive new features first can review the list of available options on the Feature flags page under Settings > Windows Update > Windows Insider Program and enable the desired ones.

The desktop watermark in the lower-right corner is normal for Windows Insider preview builds.

Features and capabilities included in these builds may never make it to the final release — Microsoft tries different concepts and collects feedback.

Features may change, be removed, or be replaced and may not leave the Windows Insider Program. Some of them may appear in future versions of Windows when fully ready.

Installation via Windows Update: go to Settings > Windows Update and click Check for updates. Update KB5089414 (build 26300.8376) will download and install automatically. A computer restart is required to complete installation.

You can also manually install the build as a participant of the Dev (Experimental) channel through Windows Insider Program settings. Note that this is an experimental Insider build and may contain unstable elements or incomplete features that will not make it to the final release.

How the new features work:

Touchpad: scroll speed and zoom adjustment: The precision touchpad driver handles gesture velocity in kernel mode via TrackpadParameters interface. WinUI 3 requires updated WinAppSDK because XAML composer's gesture routing model changed. Basic speed sliders adjust the multiplier applied to raw delta values.

Touchpad: auto-scroll: When fingers reach touchpad edge during motion, the driver generates virtual mouse wheel events via a high-resolution timer. Pressure-based mode uses Force Pad sensors sending deformation level through HID reports with Usages 0x30..0x33. Scrolling continues without lifting fingers.

Touchpad: accelerated scrolling: The system gesture tracker accumulates and exponentially scales scroll delta on repeated movements in same direction. Exponential decay filter reduces speed over time. Formula: delta = 1 + count 0.2 up to 5x max. Long documents become faster to navigate.

Touchpad: one-finger scrolling: Driver intercepts touch within 15-pixel edge zone and converts vertical finger movement to WM_MOUSEWHEEL messages. Edge zone excluded from multitouch recognition. Optional registry key: HKCU\Software\Microsoft\Touchpad\EdgeScroll. Vertical scrolling from left or right edge.

File Explorer: address bar accepts paths with double backslashes and quotes: CFileAddressBar parser normalizes input: strips quotes, replaces double backslashes with singles via PathUnescape from shlwapi.dll. Fixed dropdown list handle leak — added window handle validation before closing suggestions.

File Explorer: convenient file size format: StrFormatByteSizeW from shell32.dll called per item in Details view. Divides size by 1024 until result < 1024, picks suffix from table {L"B",L"KB",L"MB",L"GB",L"TB"}. Shows KB, MB, GB instead of raw kilobytes.

File Explorer: file renaming improvements: Fixed text reselection on double-click — LVN_ENDLABELEDIT now saves caret position. Case-only rename triggers UpdateDriverForPlugAndPlayDevices for immediate cache refresh. Cloud storage adds CF_CALLBACK_TYPE_NOTIFY_RENAME call. Improved keyboard navigation in popup context menus.

Education: free upgrade to Windows 11 Pro Education for K–12 schools: Clipupgrade.exe changes edition via ChangeProductKey API, triggering Sysprep with license switch to Pro Education. After reboot, school management components (CSP, MDM) activate via OMA-DM policies. One-way upgrade only — clean reinstall required to revert to Home.

Administrator Protection: Fixed Japanese IME issue: when Administrator Protection enabled, ctfmon.exe dropped privilege token in ImSetActiveContext call. IME now checks via GetTokenInformation(TokenLinkedToken) whether running with filtered rights.

Fix: WPN (Windows Push Notifications) service: Service hang caused by deadlock in thread pool between WpnCore.dll and WpnSession.dll during simultaneous RAW and WNS channel processing. Fixed by adding 5-second timeout via WaitForMultipleObjects.

Improvement: shortcut icon loading: Shortcut (.lnk) icon loading now uses background priority THREAD_PRIORITY_LOWEST in IDragSourceHelper queue. Previous crashes caused by race condition in multi-threaded IShellLink::GetIconLocation calls — critical section added.

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