Microsoftは10月31日(現地時間)、Windows 11のWindows Insider ProgramのDev/Betaチャンネル向けの最新ビルド「Windows 11 Insider Preview Build 26220.7051(KB5067115 )」をリリースしました。
このビルドはWindows 11 バージョン25H2をベースにしており、DevからBetaチャンネルへ切り替えることが可能となっています。切り替え可能な期間は、DevチャンネルとBetaチャンネルで同じ更新プログラムをリリースしている間のみとなっています。
Devチャンネルで公開されるビルドは、将来の機能アップデートで追加される可能性のある、さまざまな新機能が先行して実装されています。特定のリリースとは直接結びつけられておらず、ビルドに含まれる新機能や改善点は、準備が整い次第、将来のWindowsリリースに反映される可能性があります。
Windows Insider Programの更新オプションでDev/Betaチャンネルを選択し、Windows 11のプレビュー版を使用しているユーザーは、Windows Updateを利用して最新版に更新することができます。
Build 26220.7051の新機能
Build 26220.7051では、Copilotがタスクバーに統合される「Ask Copilot」が導入されています。テキスト・音声・Copilot Visionを使った直感的な操作が可能で、アプリ・ファイル・設定の検索やチャットサポートが一瞬で行えます。
ASUS ROG Xbox Allyシリーズで先行展開されていた「Full Screen Experience（FSE）」が、MSI Clawなど他のWindows 11搭載ハンドヘルドにも拡大しています。
Copilot+ PC向けに、Bluetooth LE Audioを活用した「Shared Audio（プレビュー）」が追加され、2人で映画を観たり、音楽を共有したりする場合に便利な、マルチリスニング体験が可能になります。
さらに、Windows on Arm環境でのx64アプリ互換性が向上、Prismエミュレーターがより多くのCPU機能をサポートしています。
その他以下のような修正も含まれます。
- USBキーボードが認識されない問題の修正
- スタートメニューのフォルダ表示不具合の改善
- ファイルエクスプローラーの応答性と起動速度向上
- ロック画面スライドショーによるメモリリークの修正
- 設定画面の検索ボックス表示バグの修正 など
リリースノートは以下の通りです。
New features gradually being rolled out with toggle on*
Introducing Ask Copilot in taskbar
With the new Ask Copilot in taskbar, Copilot becomes a natural part of how you use your PC, ready to help, guide and collaborate the moment you need it.
This opt-in experience gives you one-click access to Copilot Vision and Voice, enabling more natural interaction in your flow. Whether through text, voice, or guided support with Copilot Vision, you can engage on your terms, in the way that works best for you. You’re always in control. As you type, results appear and update instantly, making it easier than ever to find what you need.
To get started go to Settings > Personalization > Taskbar > Ask Copilot to enable the experience. You can also manage whether the Copilot app launches automatically at sign-in using the “Auto start on log in” toggle in the Copilot app settings.
Ask Copilot in taskbar complements the familiar Windows Search experience, so you can continue using Search as you always have from Start while trying out this new experience.
Ask Copilot uses existing Windows APIs to return apps, files, and settings—just like Windows Search—and does not grant Copilot access to your personal content. For more details, you can learn about privacy and control options for Microsoft Copilot here.
Feedback: Share your thoughts in Feedback Hub (WIN + F) under Desktop Environment > Ask Copilot in taskbar.
Full screen experience
Following the initial launch of the full screen experience (FSE) on the ASUS ROG Xbox Ally and ROG Xbox Ally X, today’s preview to Windows Insiders expands availability to additional Windows 11 handheld devices currently in market.
Designed with console-style navigation in mind, the Xbox PC app paired with the full screen experience delivers a clean, distraction-free interface for handheld gaming. You’ll get smooth task switching and optimized performance, with background processes minimized and non-essential tasks deferred—so gameplay stays responsive and uninterrupted.
How to enable FSE:
On supported devices, go to Settings > Gaming > Full screen experience, then select Xbox as your home app. Once enabled, you can access FSE from Task View and Game Bar or configure your handheld to enter full screen experience on startup.Availability:
- Currently available on ASUS ROG Xbox Ally and ROG Xbox Ally X
- Preview rolling out to MSI Claw models today
- Additional OEMs enabling their handhelds in the coming months
Feedback: Share your thoughts in Feedback Hub (WIN + F) under Gaming and Xbox > Gaming Handhelds.
Shared audio (preview)
- In this update, we are beginning rollout of shared audio (preview), a new experience built on Bluetooth® LE Audio broadcast technology, for Copilot+ PCs. Shared audio allows two family members to watch movies together while traveling, or two students to share music while studying.
- To get started, access the “Shared audio (preview)” tile in quick settings, select two supported paired and connected accessories and click “Share” to begin.
- For more information about shared audio (preview), including details about compatible PCs and accessories, visit Extending Bluetooth® LE Audio on Windows 11 with shared audio (preview).
Changes and Improvements gradually being rolled out with toggle on*
[Prism]
- We are enabling the feature update to Prism, our emulator for Windows on Arm, that makes it possible for more 64-bit x86 (x64) applications to run under emulation by adding support for more CPU features under emulation. This support will be made available to any 64-bit x86 (x64) application under emulation by default, and 32-bit x86 applications can be opted in to the support using the emulation settings in the Properties window.
- Please submit any feedback on compatibility issues or performance regressions through the Feedback Hub (Win + F) under Apps and the specific app you’re seeing issues with (if you don’t see the app listed, use “All other apps”) to help us to ensure that this updated Prism provides a great experience.
Fixes gradually being rolled out with toggle on*
[General]
- Fixed an underlying issue leading to keyboards or other USB devices not working for a small number of Insiders after the latest flights.
[Start menu]
- Fixed an issue where interacting with a folder or its contents in Start menu could result in the folder becoming invisible.
[File Explorer]
- Made some underlying changes to help responsiveness of File Explorer when navigating in network locations.
- Made some more underlying improvements to help reduce the launch time of File Explorer.
- Fixed an issue where “Open” in File Explorer’s context menu wasn’t showing the right icon for .exe, .cmd & .bat files (was showing a generic executable icon, instead of the default app for that file type).
- Fixed an issue where you might see your desktop icons move when interacting with files, such as opening or renaming them.
- Fixed a couple issues where tooltips were not showing up as expected when using navigating Home with a keyboard.
[Lock and login screens]
- Fixed a memory leak when your lock screen was set to slide show, which could lead to performance or reliability issues over time when unlocking your PC.
- Fixed an issue which could cause logging into be very slow the first time when logging into a new account.
[Settings]
- Fixed an issue where the search box in Settings could become overlapped with the minimum and maximize buttons in the title bar.
[Other]
- Fixed an issue where after the latest updates, screen readers might unexpectedly say “legacy window” without reading out the window contents when interacting with certain apps.
- Fixed an issue where after the latest updates, text might not render correctly when editing content within a multiline text box in certain apps.
- Fixed an issue where protected content playback might fail on some machines after the latest updates.
- Fixed an issue which could cause ethernet upload speeds to be significantly lower on some PCs after the latest updates.
Known issues
[Taskbar & System Tray]
- We’re investigating an issue which is causing the Start menu to not open for some Insiders on click, although it will open if you press the Windows key. It’s believed this issue may also potentially impact the notification center (which you can open with WIN + N).
- We’re investigating an issue where for some Insiders apps aren’t showing in the system tray when they should be.
[File Explorer]
- Copy progress might flash when clicking more or less details in dark mode version of the copy dialog.
- Scrollbar and footer are missing and showing a white block instead when text is scaled in dark mode version of the copy dialog.
公式ブログには細かな変更内容がリストアップされていますので、インストールする前に確認することをおすすめします。
