Microsoftは6月23日(現地時間)、Windows 11 Version 25H2/24H2用のプレビューアップデートKB5095093を公開しました。オプション扱いの更新プログラム(プレビュー版)で、多数の不具合が修正されています。Windows Updateの「更新プログラムのチェック」を利用するか、Microsoft Update Catalogからファイルをダウンロードすることで、手動でインストールすることができます。June 23, 2026—KB5095093 (OS Builds 26200.8737 and 26100.8737) PreviewWindows 11 Version 25H2/24H2用の更新プログラムKB5095093では、数分でPCを過去の状態に戻せる新しい復元機能「Point‑in‑Time Restore」が追加されています。OS・アプリ・設定・ファイルを含む「PC全体の状態」を、直近72時間以内の復元ポイントへ一気に戻せる仕組みで、従来の「システムの復元」と比較すると、対象範囲がシステム全体とより広く、72時間以内に限定することでストレージ負荷を抑制している点が異なります。その他、細かなな改善や、ごみ箱から削除する際に内部ファイル名($Rxxxxなど)が表示される不具合など、いくつかの問題の修正が行われています。リリースノートは以下の通りです。ハイライトGradual rolloutThe following summary outlines features from AI-powered Windows 11 PC experiences, along with improvements and fixes. The bold text within the brackets indicates the item or area of the change.Windows 11 PC experiencesThis section highlights some new features and enhancements for Windows 11 PCs, including AI-powered capabilities, continuous innovation, and performance improvements.[Point-in-time restore for Windows]New! This flexible recovery feature helps you quickly roll back your PC, including apps, settings, and personal files, to a recent automatic restore point. It helps reduce downtime and simplifies troubleshooting when issues occur. To learn more, see Point-in-time restore for Windows.[Windows Update]New! A calendar experience in Windows Update Settings (Settings > Windows Update) lets you pause updates by choosing an end date, for up to 35 days. You can extend the pause by selecting a different end date and re‑pause updates as needed. For more information, see Pause updates in Windows.[Widgets]New! A quieter, more focused Widgets experience helps reduce interruptions and improves default settings and notification controls:Reduce distractions: Widgets no longer open on hover. Notifications and taskbar badges are minimized by default.Simpler: Open to the Widgets dashboard by default on first use.Customize: Configure Widgets how you want by selecting Settings in the navigation bar, then changing any of the default settings.Stay informed: Dashboard icons show the number of alerts, and badges clear automatically when you leave a dashboard.Adjusted defaults: Some default settings are preserved based on usage, while others adjust to reduce interruptions.Performance improvements: This update provides improved reliability, responsiveness, and visual quality across the Widget experience.[Accessibility]New! This update makes your screen easier to see and customizes your zoom experience:Screen tint: Apply a full-screen color overlay to help reduce eye strain and improve readability. Choose from preset tint options, adjust the intensity, or turn it on automatically. Find this feature in Settings > Accessibility.Magnifier: Enter a zoom percentage directly and change it in increments in the Magnifier window for more precise, flexible control.Magnifier settings menu: You can now also modify zoom increments directly from the magnifier bar instead of navigating to Windows Settings each time.[File Explorer] New!When you hover over a file in File Explorer Home, commands such as Open file location and Ask Copilot appear as quick actions. This experience is now supported for work and school accounts (Entra ID).1Improves the speed and performance of File Explorer launch.2Fixes an issue where the OneDrive shortcut in File Explorer stops working when File Explorer is run with administrative mode.This update improves File Explorer responsiveness when mounting disk images.The address bar now supports paths containing double backslashes and quotation marks (for example, C:\\Users\\user or "C:\Users\user"), improving compatibility with a wider range of inputs.The address bar suggestion dropdown is more reliable and now consistently closes after an item is selected.This update addresses an issue on File Explorer Home where OneDrive files could appear duplicated in the Favorites section.This update includes several refinements to the Rename experience:Addresses an issue where text was repeatedly selected when renaming items in folder views.Addresses an issue where case-only name changes were not immediately reflected in folder views for items stored locally or in the cloud.[Bluetooth] This update improves reliability and performance when connecting to and using Bluetooth devices: New! Windows now keeps the microphone mute state in sync between the audio mixer and the Hands-Free Profile (HFP) for a more consistent experience with Bluetooth headphones with mute buttons or indicators.Accessory compatibility workarounds: Improves compatibility with specific Bluetooth audio devices, helping AirPods appear faster in pairing mode and improving microphone reliability on Beats Studio Pro headphones.Bluetooth audio stability:Improves overall Windows stability with certain PC manufacturer drivers (error code 0x9F).Improves Bluetooth reliability for voice calls when using Classic Audio devices with the Hands-Free Profile (HFP). Reduces time for LE Audio accessories to start playing audio while using the microphone. Device management: Windows will no longer show a “Remove failed” message when attempting to remove Bluetooth devices if the Bluetooth radio is unavailable or has changed since pairing. Settings experience: Improves stability when using the Bluetooth & devices settings page for a smoother, more consistent experience. Connection reliability and responsiveness:Reduces the time it takes for classic Bluetooth audio devices to reconnect after Windows resumes from hibernation.Improves reliability when LE Audio accessories disconnect, such as when another device (for example, a phone) connects.Improves reliability of LE Audio streaming after a connection is lost and restored. [Bluetooth and Phone Link] This update improves audio routing for calls made through a connected phone:When an outgoing call is dialed from a paired phone, audio remains on the phone while ringing and transfers to the PC only when the call is answered from the PC.When Do Not Disturb is enabled on Windows, incoming call audio from a paired phone no longer rings on the PC.[Voice access and voice typing]New!You can now use voice access and voice typing in French, German, and Spanish. As you speak, your PC improves your text in real time. It corrects grammar, punctuation, and recognition errors, and helps improve clarity—even in the presence of background noise. This makes dictation smoother and reduces the need for manual edits.3[Audio] This update improves the reliability of the inbox HD Audio driver.[Taskbar] This update improves the reliability of opening the Start menu when selecting the left edge of the taskbar when the icons in the taskbar are left-aligned.[Networking]This update includes networking improvements for virtualized environments. Confidential Virtual Machines (CVMs) now use SR-IOV hardware acceleration by default for improved network throughput, and a configuration issue in nested Hyper-V virtualization network setup has been corrected to ensure reliable VM network provisioning.This update improves the reliability of the Windows networking stack. It reduces bug checks (blue screen errors) related to Wi-Fi power and improves cellular (WWAN) connectivity, including support for IPv6 VPNs. Compatibility with third-party VPN software and SR-IOV configurations on server hardware is also improved. Network adapter settings and bindings are now preserved across OS upgrades.[Printing]New! New printer installations use Internet Printing Protocol (IPP) by default when supported, simplifying setup and improving reliability. For details about third-party driver deprecation, see End of Servicing Plan for Third-Party Printer Drivers on Windows. To control this behavior, use the toggle in Settings > Bluetooth & devices > Printers & scanners > Default install printers using Windows Ready Print. For more information, see Introducing Windows Ready Print and modernized driver selection. For more information, see Introducing Windows Ready Print and Modernized Driver Selection.[Windows Subsystem for Linux (WSL)] The update improves usage of WSL in mirrored networking mode with VPNs.[Display and graphics]Improves the reliability of rendering content while scrolling for certain apps spanning across multiple monitors.Improves the reliability and persistence of applying color profiles.[Location services] This update changes how some location settings are displayed in Settings > Privacy & Security > Location to help with clarity. When location services are turned off, settings like Default location and Allow location override don't immediately apply, since location information is not given to apps or services. These settings will now be greyed out when location services are off to reduce confusion over when they take effect.[Search] This update improves the reliability of setting Search related group policies.[Input] New! You can now customize the size of the right-click zone in Settings > Bluetooth & devices > Touchpad. Choose from default, small, medium, or large to control how much of the bottom-right corner responds to a single-finger right-click. This setting is only available on touchpads with a pressable surface. If your device manufacturer provides customization through their own app, a Custom option will appear to reflect those settings.This update improves recognition of English characters when using Japanese handwriting.[General performance] Improves the time to shut down Background Intelligent Transfer Service (BITS) when you turn off your PC.[General Reliability] This update improves the reliability of explorer.exe. It addresses issues on the login and lock screens related to third-party credential providers, reduces the probability of taskbar icons appearing as blank gray placeholders, and improves navigation to Home in File Explorer during OneDrive sync. It also improves explorer.exe reliability when switching between desktops, enhances app launch with shell extensions, and using acrylic blur effects in the Start menu, Settings, and the lock screen.[Apps] Resolves an issue where some installers and applications could show unexpected elevation (UAC) prompts after installing KB5089549.[Remote Desktop] This update refreshes the dialog design when you enable Remote Desktop in Settings > System > Remote Desktop.[Graphics Kernel] Improves memory-management policy that allows PCs with more than 32GB of installed memory to run larger local AI models. 1Feature availability depends on your device and market. This feature isn’t available in the European Economic Area. 2Feature availability depends on your device and market. 3Available on Copilot+ PCs. Learn more about Copilot+ PCs at aka.ms/copilotpluspcsNormal rolloutThis non-security update includes quality improvements. The following summary outlines key issues addressed by the KB update after you install it. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.[Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.[Authentication] This update improves Netlogon secure channel connections between domain controllers, enabling successful connections from member servers to domain controllers set up before 2025.[Emoji Panel Update] The emoji panel (Windows key + period (.)) now uses GIPHY for GIF content following the deprecation of Google’s Tenor API. Starting June 30, 2026, install the latest Windows update to continue using GIFs in the Emoji panel. If you don’t update, you will see a "GIF service is not available" error in the panel. Installing the latest Windows update will restore access to GIFs.[Networking] This update improves how your device connects to shared network resources. Connections used by apps and system features, such as the NetUseAdd function, now work more reliably, including unauthenticated (null session) connections.[Recycle Bin (known issue)] Fixed: This update addresses an issue where the confirmation dialog might display an internal Recycle Bin file name instead of the original file name when permanently deleting a file. This issue might occur after installing the June 2026 security update (KB5094126).[Taskbar] This update improves notification badge display across your apps. Notification counts and badge visuals now update correctly, helping you stay up to date with new activity.If you installed earlier updates, your device downloads and installs only the new updates contained in this package.既知の不具合更新プログラムには以下の1件の既知の不具合が存在します。Microsoft Office applications might fail to open from certain third-party appsSymptomsMicrosoft has received reports of an issue in which certain third-party applications might be unable to launch Microsoft Office applications or open documents after installing the Windows updates released on or after June 9, 2026. This issue affects certain third-party applications that use OLE automation to interact with Microsoft Office applications. In some cases, the Office application or document might fail to open without displaying an error message.Affected Microsoft Office applications might include Word, Excel, PowerPoint, Access, and other Microsoft Office applications when launched from within the affected third-party application.Reports indicate that this issue may affect applications such as CCH Engagement, Workpaper Manager, dental software (such as Dentrix and Softdent), and Zotero; other similar applications might also be impacted.Third-party information disclaimerThe third-party products listed are manufactured by companies that are independent of Microsoft. We make no warranty, implied or otherwise, about the performance or reliability of these products.WorkaroundA resolution is in progress and will be included in a future Windows update. More information will be shared when it becomes available.To work around this issue, open the application or document directly instead of launching it from the affected third-party application.For organizations, a workaround is available for affected devices. To apply this workaround in your organization and mitigate the issue, please contact Microsoft Support for business.更新プログラムはWindows Updateの他、Microsoft Update Catalogを利用してインストールすることができます。