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Do you know any work-around for this situation?
I know that IE don't trust the mime-type 'sent' by the server [the Content-type header], instead he brainless try to read the first bytes of a 'non plain text/html' file, with the goal of understanding what it is.
So, maybe IE try to read the first encrypted bytes, and hangs on them.. ;)
1] some obscure Micro$oft proprietary Content-type..
2] A RewriteRule or BrowserMatch that redirect any '*.mp3' browser's request to normal, non-encrypted port 80 [easy, if you want I post the snippet].
But I don't know if this is acceptable for you.. :)