Microsoftは8月26日(現地時間)、Windows 10 Version 22H2用のプレビューアップデートKB5063842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。August 26, 2025—KB5063842 (OS Build 19045.6282) PreviewWindows 10 Version 22H2用の更新プログラムKB5063842では、一部の補助文字がテキストボックスで正しく表示されない問題の修正、簡体字中国語IMEで拡張文字が空白になる問題の修正、検索ウィンドウでプレビュー表示が正しく行われない問題の修正などが行われています。リリースノートは以下の通りです。概容[Common Controls] Fixed: An issue that affects how certain supplementary characters appear in Windows textboxes.[Input and Composition] Fixed: An issue with the Chinese Simplified Input Method Editor (IME). Some extended characters were shown as empty boxes.[Licensing] New! This update adds a new feature that allows customers using the Windows 10 keyless Commercial ESU solution—alongside a Windows 365 subscription—to block outbound network traffic. This enhancement supports compliance with Zero Exhaust policies.[Mobile Operator Profiles] Updated: Country and Operator Settings Asset (COSA) profiles.[Multimedia] Fixed: An issue where mf.dll failed to enumerate redirected web camera devices on Remote Desktop Services (RDS) environments.[Windows Hello] Fixed: An issue in which Narrator reads the incorrect name for the "Enhance Facial Recognition Protection" check box under the Facial Recognition setting.[Search pane] Fixed: An issue that might cause the Windows Search pane to not show the preview pane correctly.[Family Safety] Fixed: An issue where the "Ask to Use" approval flow was not being triggered for blocked apps. With this fix, the approval flow now appears as expected when a blocked app is accessed.[Portable Devices] Fixed: An issue where the Removeable Storage Access policy may not work properly.[Windows Backup for Organizations] New! Windows Backup for Organizations is now generally available! Experience seamless device transitions with enterprise-grade backup and restore. Whether you're refreshing your organization’s devices, upgrading to Windows 11, or deploying AI-powered PCs, this solution helps sustain productivity with minimal disruption, ensuring business continuity and organizational resilience.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。 Network Device Interface streaming performance issue SymptomsAfter installing the August 2025 Windows security update (KB5063709), you might experience delays or uneven audio and video performance when using Network Device Interface (NDI) to stream or transfer feeds between PCs.This issue affects streaming apps such as OBS Studio (Open Broadcaster Software) and NDI Tools, especially when Display Capture is enabled on the source PC. The problem can even occur under low-bandwidth conditions.WorkaroundTo work around the issue, NDI recommends manually changing the NDI Receive Mode to use TCP or UDP instead of RUDP. For steps to do this, see the NDI support site: Traffic Drops After Windows Update. Next stepThe issue is under investigation, and additional information will be shared as soon as it becomes available.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。