Microsoft: Windows KB5124010 update crashes some games and apps
Windows KB5124010 update causes crashes in games and apps using AC-3 audio decoding.
Microsoft has acknowledged that the September 2026 optional Windows 11 preview update, KB5124010, is causing crashes in some games and applications that utilize AC-3 (Dolby Digital) audio decoding. While the issue primarily affects legacy applications, it can also impact modern apps if they rely on the Windows built-in decoder. Microsoft is working on a fix.
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The lesson from this incident
Full lessonMicrosoft's optional September 2026 Windows 11 preview update (KB5124010) introduced a regression that breaks AC-3 (Dolby Digital) audio decoding, crashing affected games and applications. This highlights the inherent risk of deploying preview/optional updates in production or gaming environments without adequate testing. The issue demonstrates that even vendor-supplied patches can introduce new instabilities, making pre-deployment validation and staged rollouts essential practices. Organizations and end users who applied the update without a rollback plan may face disruption until Microsoft delivers a fix.
