Microsoft’s November 2025 preview update, KB5070311, is one of the biggest feature drops Windows 11 has seen all year. Although optional, this release packs a wide mix of UI polish, File Explorer refinements, AI upgrades for Copilot, gaming improvements for handheld PCs, and dozens of stability and reliability fixes. Whether you’re running Windows 11 version 24H2 or 25H2, this cumulative update delivers a noticeable boost to daily usability—especially if you rely on dark mode or modern Windows shell features.

Below is a complete look at what KB5070311 includes, who should install it, and everything you need to know before updating.

Which Windows 11 Builds Receive KB5070311

KB5070311 applies to the following Windows 11 versions:

• Windows 11 24H2 (all editions) → updated to build 26100.7309
• Windows 11 25H2 (all editions) → updated to build 26200.7309

To confirm your build, press Win + R, type winver, and hit Enter.

Because this is a cumulative preview update, the package is fairly large:

• x64: ~4.3GB
• ARM64: ~3.9GB

A single reboot is required to finish installation.

How to Install KB5070311

You can install the update through Windows Update or by downloading the standalone .msu package from the Microsoft Update Catalog.

Method 1: Install KB5070311 Through Windows Update

KB5070311 shows up under optional preview updates. It will only appear if your system already runs 24H2 or 25H2.

1. Open Settings > Windows Update
2. Enable Get the latest updates as soon as they’re available (optional but recommended)
3. When 2025-11 Cumulative Preview Update (KB5070311) appears, select Download & install

Your device will reboot into build 26100.7309 or 26200.7309 once installation completes.

Method 2: Install KB5070311 Offline (.msu Packages)

For offline deployment, enterprise staging, or air-gapped devices, you can download the standalone installer from the Microsoft Update Catalog.

Available Downloads

Note: Some servicing paths require prerequisite KB5043080.

Offline Installation Option A: Let DISM Handle Prerequisites Automatically

1. Download all MSU files into a folder such as C:\Packages
2. Open Command Prompt (Admin)
3. Run:

DISM /Online /Add-Package /PackagePath:C:\Packages\Windows11.0-KB5070311-x64.msu

Restart when prompted.

DISM will automatically apply prerequisite MSUs in the correct order.

Offline Installation Option B: Install Each MSU Manually

If you prefer full control, install each update individually (prerequisite first):

Example:

DISM /Online /Add-Package /PackagePath:C:\Packages\windows11.0-kb5043080-x64.msu
DISM /Online /Add-Package /PackagePath:C:\Packages\windows11.0-kb5070311-x64.msu

You may also double-click each .msu to use wusa.exe instead.

To update offline images, replace /Online with:

/Image:<mount directory>

What’s New in KB5070311

Microsoft has spread these improvements across UI updates, AI features, File Explorer enhancements, gaming optimizations, and system stability fixes.

Dark Mode Improvements and File Explorer Enhancements

System Dialogs Finally Respect Dark Mode

A major highlight of this update is the overhaul of legacy dialogs. Windows now applies dark mode consistently across:

• Copy/move progress windows
• Delete confirmations
• “File in Use” dialogs
• Skip/replace file prompts
• Error/information dialogs

Previously, many of these UI elements would ignore dark mode and display bright white pop-ups. That inconsistency has now been addressed.

A Cleaner, Simpler Context Menu

File Explorer now offers a reorganized, streamlined context menu that groups common actions (Share, Copy, Move) more logically. This improves accessibility and reduces clutter.

Because this is a phased rollout, not all devices will see the new menu immediately.

Additional File Explorer Fixes

KB5070311 also resolves:

• Video thumbnails failing due to specific EXIF metadata
• Random toolbar bugs
• “Open” right-click icons displaying placeholders instead of default app icons

Start Menu and Windows Search Alignment

On systems with the redesigned Start menu, Windows Search now matches the Start menu’s height for smoother visual transitions. This is cosmetic but noticeably improves usability.

Rollout remains selective—your device may not receive the new Start menu immediately.

New “Virtual Workspaces” Settings Page

Windows 11 now consolidates virtualization settings under:

Settings > System > Advanced > Virtual Workspaces

This page provides easy access to:

• Hyper-V components
• Windows Sandbox
• Virtual Machine Platform
• Containers
• Windows Hypervisor Platform

The functionality is not new, but the UI is far more accessible than the legacy Windows Features dialog.

Gaming: Expanded Full Screen Experience for Handheld PCs

Originally exclusive to the ASUS ROG Ally, Windows 11’s Full Screen Experience (FSE) now supports additional handheld gaming devices.

FSE offers:

• A console-like UI centered around the Xbox app
• Reduced background resource usage
• Controller-friendly navigation
• Optional direct-to-FSE boot

Enable under Settings > Gaming > Full screen experience.

Copilot and AI Feature Upgrades

Share App Windows Directly to Copilot

Hovering over a taskbar thumbnail now exposes a Share with Copilot option, letting Copilot analyze the visible app window—helpful for summarizing documents, diagrams, charts, etc.

Copilot+ PCs Receive Exclusive Enhancements

Users with eligible hardware get:

• Settings Agent with contextual suggestions
• Click to Do, surfacing actions for images or tables
• Expanded camera support for Windows Studio Effects (USB webcams included)
• Semantic search for Photos content via Windows Search

Several deep AI components also update to version 1.2511.1196.0, though these activate only on Copilot+ hardware.

Desktop, Widgets, Input, and Keyboard Improvements

Desktop Spotlight

The right-click menu now adds:

• “Learn more about this background”
• “Next desktop background”

Widgets

You can now choose a default dashboard, and dashboard icons show unread indicator badges.

Pen Haptics & Keyboard Backlight

Supported devices receive:

• Better tactile feedback for pen actions
• Improved adaptive brightness for backlit keyboards

Settings App Refinements

Microsoft continues migrating legacy Control Panel items into Settings, including:

• Keyboard character repeat and cursor blink settings
• Accessibility refinements

Bug fixes include:

• Settings freezing under Network & Internet
• Search bar overlapping window controls
• A clearer OneDrive status icon on the Accounts homepage

Quick Machine Recovery Enhancements

When Quick Machine Recovery and automatic solutions checks are enabled, Windows now performs a one-time scan for known issues and suggests recovery actions when available.

Display, Graphics, and Windows on Arm Improvements

Display Fixes

This update resolves:

• Micro-stutters on ultra-high-resolution monitors
• Brightness slider reverting to previous values
• Games falsely detecting unsupported GPUs

Windows on Arm: Prism Upgrade

Prism now supports x64 apps using:

• AVX
• AVX2
• BMI
• FMA
• F16C

This dramatically increases app compatibility on ARM-based Windows PCs.

Taskbar and Windows Share Improvements

Taskbar Enhancements

KB5070311 adds:

• Animated transitions when hovering grouped icons
• Fixes for taskbar auto-hide failures
• Corrections for icon scaling bugs
• Voice access improvements for interacting with taskbar UI

Windows Share

Enhancements (region dependent):

• Multi-file drag-and-drop in the share tray
• More relevant app targets
• Ability to share OneDrive file links through other apps

Security and Reliability Fixes

Critical fixes include:

• LSASS stability improvements (reducing forced logouts/restarts)
• Explorer crashes caused by certain notifications
• SMB search failures
• Settings crashes under Privacy & Security
• Smart card logon errors
• First-time sign-in slowness
• Memory leaks when using slideshow lock screens

Known Issues in KB5070311

1. White Flash in File Explorer (Dark Mode)

A brief bright flash may appear when opening Explorer in dark mode or switching tabs/views.

No workaround exists besides removing the update.

2. Missing Password Icon on Lock Screen

The password option still works, but its icon may be invisible.

Clicking the empty spot still opens the password entry field.

Servicing Stack Update Included: KB5071142

Windows 11 24H2 also receives servicing stack update KB5071142 (26100.7295).
This component ensures reliable installation of future updates—and cannot be removed.

Conclusion: Should You Install KB5070311?

KB5070311 is a feature-packed preview update that brings smoother dark mode support, better File Explorer behavior, new shell refinements, expanded gaming capabilities, and important security fixes. If you enjoy early access to new Windows features and don’t mind minor preview-build glitches—particularly the dark-mode flash bug—this update is worth installing.

If you prefer stability above all else, you may want to wait until these improvements roll into a mandatory security release.