Making some inroads. The file type returned in the HTTP header for audio files is this: text/plain; charset=utf-8
Accoding to this article, Firefox is actually the correct implementation amongst the browsers for this, because it respects the file type indicated by the server: https://developer.mozilla.org/en/Properly_Configuring_Server_MIME_Types So, I guess now, I'll have to figure out how to make Rocket return the correct file types (to debug audio with Firefox without changing partition) or I suppose I could setup Apache on my Windows partition which I need to debug IE.