Microsoft has acknowledged an issue related to a Windows update (KB5124010) released on September 22, 2026, which has caused unexpected closures of various games that rely on AC-3 audio decoding. This issue affects Windows 11 versions 24H2, 25H2, and 26H2, while server editions remain unaffected. The problem primarily impacts legacy applications that depend on Windows' built-in audio decoding, particularly older PC games using the Dolby Digital codec for pre-rendered cutscenes and licensed soundtracks. Microsoft has confirmed the issue but has not provided a list of affected titles, workarounds, or a resolution timeline. The status remains unchanged as of October 7, and the issue persists regardless of user action.