Windows 11 Insider Preview Build 26120.3360がリリース - Dev/Betaチャンネル向け、CPUモニタリング機能の改善など

2025年3月1日

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Microsoftは本日、Windows 11のプレビュービルド「Windows 11 Insider Preview Build 26120.3360」を、Windows Insider ProgramのDev/Betaチャンネル向けにリリースしました(Windows Blog)。

現在、Betaチャンネルに対してもWindows 11 Version 24H2をベースとしたプレビュー版の提供が行われています。Betaチャンネルでは最初、24H2ベースのビルドはオプションのアップデートとして提供されますが、今年後半には24H2ベースに自動的に切り替わります。Betaチャンネルでは、それまでは23H2/24H2ベースの両方の更新プログラムが受信可能です。

また、DevチャンネルではBetaチャンネルと同じビルドが提供されている間、Betaチャンネルへ切り替えることができるようになります。2月末になると、Devチャンネルに対してはより高いビルド番号のアップデートが提供されるようになり、チャンネルの切替はできなくなります。

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 26120.3360の新機能

Build 26120.3360では欧州経済領域(EEA)でロック画面ウィジェットのサポートの展開が始まり、Weather、Watchlist、Sports、Trafficといったロック画面ウィジェットを追加、削除、並べ替えできるようになっています。また、タスクマネージャーでCPU使用率を計算する方法が変更され、より正確な情報を表示することができるようになっています。

リリースノートは以下の通りです。

New features gradually being rolled out to the Dev Channel with toggle on*

Choose what Lock screen widgets appear

We’re beginning to roll out support for lock screen widgets (previously referred to as “Weather and more”) to Windows Insiders in the European Economic Area (EEA). You can add, remove, and rearrange lock screen widgets such as Weather, Watchlist, Sports, Traffic, and more. Any widget that supports the small sizing option can be added here. To customize your lock screen widgets, navigate to Settings > Personalization > Lock screen. We are starting this rollout first with Insiders in the EEA and plan to expand to Insiders in other regions in the future. Insiders outside the EEA will continue to see the “Weather and more” experience.

As part of this, we’re also adding support for a new group policy called “Disable Widgets On Lock Screen” that will allow IT administrators to disable lock screen widgets without disabling widgets elsewhere on PCs they manage. To edit this policy, please launch the Local Group Policy Editor app and navigate to Computer Configurations > Administrative Templates > Windows Components > Widgets. This policy is only supported in EEA regions at this time but will expand to include other regions in the future as well.

FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Desktop Environment > Lock screen.

Changes and Improvements gradually being rolled out to the Dev Channel with toggle on*

We are beginning to roll out a change to the way Task Manager calculates CPU utilization for the Processes, Performance, and Users pages. Task Manager will now use the standard metrics to display CPU workload consistently across all pages and aligning with industry standards and third-party tools. For backward compatibility, a new optional column called CPU Utility is available (hidden by default) on the Details tab showing the previous CPU value used on the Processes page.

[Windows Share]

We are adding the ability to share directly to apps that support sharing in Windows when right-clicking on local files in File Explorer or the desktop.

Fixes gradually being rolled out to the Dev Channel with toggle on*

[File Explorer]

Fixed an issue where File Explorer Home might not load correctly and just show random floating text saying “Name”.

[Taskbar]

Fixed an issue where the underlines under app icons in the taskbar may get stuck showing even if the app had been closed.

[Remote Desktop]

Fixed an issue which was leading to some people experiencing Remote Desktop freezes on login, or frequent disconnects.

[Settings]

Fixed an issue where an underlying crash was causing Settings to show an error message on launch (“The instruction at 0x00007FFEDEBDC003 referenced memory at 0x0000000000000010. The memory could not be read,”). If impacted, you might also have seen a similar error message with RuntimeBroker.exe.

[Other]

Fixed an issue where if you were upgrading to a higher build number and it failed and rolled back, it could potentially result in a duplicate Windows entry in the boot menu.

Fixed an issue for Insiders using the ability to resume OneDrive files, which could result in your mouse frequently showing a spinning icon.

Known issues

[General]

After you do a PC reset under Settings > System > Recovery, your build version may incorrectly show as Build 26100 instead of Build 26120. This will not prevent you from getting future Dev Channel updates which will resolve this issue.

[Recall]

[REMINDER] Make sure you update Microsoft 365 apps to the latest version so you can jump back into specific documents.

The following known issues will be fixed in future updates to Windows Insiders:

Some Insiders may experience an issue where Recall is unable to automatically save snapshots, and the setting can’t be turned on in Settings. We’re working on a fix for this issue.

Recall can be enabled or disabled from “Turn Windows features on or off”. We are caching the Recall binaries on disk while we test add/remove. In a future update we will completely remove the binaries.

[Click to Do]

[REMINDER] If any of your actions on image entities are no longer appearing, please ensure you have the latest updates for the Photos and Paint app from the Microsoft Store.

[REMINDER] The intelligent text actions leverage the power of Microsoft’s secure cloud to improve your text results by ensuring prompts and responses are safe and appropriate. This data is automatically deleted. Local moderation to ensure the safety of prompts and responses will be added in the future, replacing this cloud endpoint.

The following known issues will be fixed in future updates to Windows Insiders:

Sometimes additional context is given when using more intelligent text actions powered by Phi Silica.

[Improved Windows Search]

[REMINDER] For improved Windows Search on Copilot+ PCs, it is recommended that you plug in your Copilot+ PC for the initial search indexing to get completed. You can check your search indexing status under Settings > Privacy & security > Searching Windows.

[File Explorer]

We’re working on the fix for an issue causing File Explorer to be very slow to close for some Insiders when closing using the X button. This may also have an impact on the other title bar buttons.

[Task Manager]

[NEW] After adding the new CPU Utility column, you may notice that System Idle Process always shows as 0.

[NEW] The CPU graphs in the Performance page are still using the old CPU utility calculations.