In reply to:

IE might still base everything solely on extensions, which would mean that if I were sent a file mpegs.txt with the content-type set to audio/x-mpeg-url (or whatever it is), IE might still open it in a text editor instead of sending it to WinAMP. I'm too lazy to test it




Nope, it handles file types properly, if a proper header is sent. I send mp3 files and playslists as .php files, and IE handles it just fine.
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