Windows 10 Build 10074 Sounds !free!

As we now know, this was not just a bug in a preview build; it was a harbinger of things to come.

If you were running Build 10074 and wanted to listen to the new sound scheme, or if you were a developer trying to identify the specific updated files, they could be found in the system directory. C:\Windows\Media windows 10 build 10074 sounds