@devephant, We just verified that the latest Corona build plays the audio sample apps on Windows 8, 64 bits.
If you noticed that audio stopped working with a daily build and you went back to the release build 971) and it still doesn’t work, something must have changed in your audio system to affects the audio. Corona uses OpenAL and may take a different audio path than the Media Player app. You could try reinstalling Corona but it sounds like the real fix is figuring out what changed in your system to cause the audio problem to occur.
As a test you could trying running the EventSound sample app. On Windows this will beep one time (it should be once a second but it doesn’t because of a Simulator bug). This goes through a different audio path (not OpenAL) and could indicate if the OpenAL path is causing the problem. This test is more for informational purposes because we really don’t think anything is broken in Corona’s audio engine.
As I mentioned before, no other users are saying that Corona audio is no longer working. The 971 release build has been out since December without any issues in this area and we know a lot of users are using Windows 8.