微软确认Windows 11的26H2更新中包含的KB5124010补丁存在严重的AC-3音频解码问题1。该缺陷导致依赖系统内置音频解码的游戏和应用崩溃，影响范围涵盖Windows 11的24H2、25H2和26H2三个版本1。受影响的应用包括游戏、媒体播放器和生产力工具，而问题组件msmpeg2ac3dec.dll仅存在于从Windows 11 22H2升级而来的系统中1。
微软正在开发修复程序。在正式补丁发布前，用户可通过"设置 > Windows 更新 > 更新历史记录 > 卸载更新"移除KB5124010来暂时解决问题1。
这一缺陷是9月更新系列引入的多个故障之一。9月8日发布的KB5124008修复了974个安全漏洞但同时引入新问题，9月14日的带外更新KB5129195虽修复部分问题却又引发文件历史记录失效Bug，到9月22日发布的KB5124010则修复了文件历史记录检测驱动器问题，但备份功能仍未完全恢复1。
Microsoft has confirmed that the KB5124010 patch included in Windows 11's 26H2 update contains a critical AC-3 audio decoding issue that is causing games and applications to crash 1. The problem affects systems relying on the built-in audio decoder for AC-3 (Dolby Digital) audio playback 1. The faulty component, msmpeg2ac3dec.dll, only exists on systems that were upgraded from Windows 11 22H2, which means the issue impacts the 24H2, 25H2, and 26H2 versions of Windows 11 1. Affected applications include games, media players, and productivity tools 1. As a temporary workaround, users can uninstall the KB5124010 patch through Settings > Windows Update > Update History > Uninstall Updates 1.
This audio decoding problem is one of several issues introduced through Microsoft's September update cycle 1. The KB5124008 update released on September 8 addressed 974 security vulnerabilities but inadvertently introduced multiple new problems 1. A subsequent out-of-band update, KB5129195, released on September 14, resolved some issues but created a new bug affecting File History functionality 1. The KB5124010 patch released on September 22 was intended to fix a File History drive detection problem, though backup features have not been fully restored 1. Microsoft is developing a permanent fix for the AC-3 audio decoding issue 1.
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