Microsoftは7月18日(現地時間)、Windows 11のWindows Insider ProgramのDevチャンネル向けの最新ビルド「Windows 11 Insider Preview Build 26200.5710(KB5062676)」をリリースしました(Windows Blog)。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 26200.5710の新機能Build 26200.5710では、Copilot+ PC向けの「Click to Do」が改良され、画像やグラフ、チャートの内容を説明する「describe image」アクションがIntel・AMD搭載Copilot+ PCでも利用可能になりました。また、PCのパフォーマンスが低下した場合にログを自動的に収集する機能が追加されています。パフォーマンス向上の取り組みの一環として追加された機能で、パフォーマンス低下に関連したPCの問題が発生した場合はフィードバックを提供することが推奨されています。リリースノートは以下の通りです。New Copilot+ PC experiencesNew describe image action in Click to Do rolling out for AMD and Intel®-powered Copilot+ PCsWe are introducing a new “describe image” action in Click to Do to get detailed descriptions of images, charts and graphs for AMD and Intel®-powered Copilot+ PCs. This feature was introduced for Snapdragon-powered Copilot+ PCs in the previous Dev Channel flight. This feature is useful to get a quick overview of the visual content. This feature is designed to improve accessibility and can be used by everyone in scenarios like getting a quick overview of a graph or a chart, generating alt text for artefacts you create, etc. When you use the action for the first time, the required models are set up, and the descriptions are generated locally on your device making sure your sensitive data stays on your PC.You can learn more about using Click to Do here. You can check out frequently asked questions about rich image descriptions here.FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Desktop Environment > Click to Do.Making visual content more accessible with image descriptions in NarratorWe are enhancing digital accessibility with the ability to get rich, detailed descriptions of images, charts, graphs in Narrator by using the power of AI on Copilot+ PCs. In today’s digital world, images are everywhere—on websites, apps, and documents. But for blind and low-vision users, many of these visuals remain inaccessible due to missing or inadequate alt text. After beginning the rollout for this feature for Snapdragon-powered Copilot+ PCs, we are also now rolling this feature out for AMD and Intel®-powered Copilot+ PCs.With this new feature that is beginning to roll out, Narrator will now generate richer image descriptions on your Copilot+ PC. Simply press Narrator key + Ctrl + D and Narrator will read out a contextual description of the image describing people, objects, colors, text, and numbers from the image. On non-Copilot+ PCs, this experience will continue to give you very basic image descriptions.For example, for an image about stock performance, users will get the following detailed description. The image is a graph showing the stock prices of Microsoft Corporation, with the S&P 500 and NASDAQ Computer indexes. The graph shows a steady increase in Microsoft’s stock price over the period from June 18th to June 23rd.The window also contains regenerate, like, dislike and copy button at the bottom.To turn Narrator on, you can press “Ctrl + Windows key + Enter” on your PC or search for “Narrator” in Windows search box. When you try the image descriptions feature for the first time using Narrator Key + Ctrl + D, we download the models required for getting image descriptions. You can check the download status via Settings > Windows update.If you are new to Narrator, you can find more information and learn about using Narrator from the complete guide to Narrator.Also check out frequently asked questions about rich image descriptions in Narrator here.FEEDBACK: Please file feedback in Feedback Hub (WIN + F) under Accessibility > Narrator.Changes and Improvements gradually being rolled out to the Dev Channel with toggle on*[General]As part of our commitment to improving Windows performance, logs are now collected when your PC has experienced any slow or sluggish performance. Windows Insiders are encouraged to provide feedback when experiencing PC issues related to slow or sluggish performance, allowing Feedback Hub to automatically collect these logs, which will help us root cause issues faster. Use the Desktop > System Sluggishness category when filing feedback to allow Feedback Hub to automatically pick up these logs. These logs are stored locally (%systemRoot%\Temp\DiagOutputDir\Whesvc folder) and only sent to Microsoft via Feedback Hub when feedback is submitted.[Click to Do (Preview)]The following changes and improvements are rolling out for Click to Do on Copilot+ PCs:We are trying out a change that removes the search box in the top bar of Click to Do.[Lock screen]We’re updating lock screen widgets experience for Windows Insiders in the Dev Channel, with widget suggestions to help you easily discover more widgets. This feature can be enabled or disabled with the “Discover widgets” toggle under Settings > Personalization > Lock screen. Please note this experience is still being refined and will change in future flights.[Settings]You can now visit the Settings > Privacy & security > Text and image generation to see which third-party applications recently used generative AI models provided by Windows. This page gives you visibility into the specific apps leveraging local Windows provided generative AI models and allows you to control which apps are permitted to use them—putting you in charge of your device’s AI experience. The UI is present in this flight today, however the functionality will light up in a upcoming flight.Fixes gradually being rolled out to the Dev Channel with toggle on*[Notification Center]Fixed an issue where if you’d enabled the clock in Notification Center it might result in the Notification Center content getting clipped.[Other]Fixed an underlying issue with dbgcore.dll, which could lead to explorer.exe and some other apps crashing recently.Known issues[General]Some Windows Insiders may experience a rollback trying to install this update with a 0x80070005 in Windows Update. We’re working on a fix for Windows Insiders impacted. If you are impacted, using Settings > System > Recovery > “Fix issues using Windows update” may resolve the issue.You may see multiple error pop ups about unexpected elements when opening Group Policy Editor.[Start menu]The following are known issues for Windows Insiders with the new Start menu:Using touch to navigate the new Start menu may not work reliably. For example, it currently does not support the swipe-up gesture.Drag and drop capabilities are limited from “All” to “Pinned.”[Live Captions][NEW] Live captions may crash when attempting to use live translation on a Copilot+ PC.[Xbox Controllers]Some Insiders are experiencing an issue where using their Xbox Controller via Bluetooth is causing their PC to bugcheck. Here is how to resolve the issue. Open Device Manager by searching for it via the search box on your taskbar. Once Device Manager is open, click on “View” and then “Devices by Driver”. Find the driver named “oemXXX.inf (XboxGameControllerDriver.inf)” where the “XXX” will be a specific number on your PC. Right-click on that driver and click “Uninstall”.[Click to Do (Preview)]The following known issues will be fixed in future updates to Windows Insiders:Windows Insiders on AMD or Intel®-powered Copilot+ PCs may experience long wait times on the first attempt to perform intelligent text actions in Click to Do after a new build or model update.[Input]The Microsoft Changjie Input method doesn’t work properly in this build – not able to select words. Reverting to the previous version of the IME in Settings should mitigate the issue while we work on a fix. 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。