Interestingly, Build 10074 also contained hidden system files that hinted at experimental startup chimes—short, ambient tones that reflected the "flat" design language. These were rarely heard by the average user but represented Microsoft's experimentation with audio branding that was "there, but not there."
It was beautiful, haunting, and completely wrong for a productivity OS. Users on Reddit and the now-defunct MSFN forums described it as: windows 10 build 10074 sounds
Instead, 10074 retains the for events like "Windows User Account Control" and "Desktop Mail Notification." The only real difference is a subtle system-wide volume normalization – sounds feel slightly less "punchy" than on pure Windows 8.1. Windows 10 Build 10074 was a pre-release version
Windows 10 Build 10074 was a pre-release version of Windows 10, released on May 27, 2015. It was a part of the Windows Insider Program, which allowed users to test and provide feedback on upcoming Windows builds. released on May 27