Windows 10 build 10240 was the release-to-manufacturing build that preceded the operating system's public launch in July 2015, making it a reference point for early adopters and Windows enthusiasts. Short background tones from that build later circulated on soundboards and in tech videos, where they function less as alerts and more as period detail. The clip remains useful because Windows 10 was used on hundreds of millions of devices, so even a brief, understated sound can instantly place a scene in the mid-2010s computing era.