Problem

iTunes’ podcasting application refuses enclosures that do not end in an extension that it can recognise as an understandable file format. Example:

• http://myhost/site/myfile.mp3 GOOD
• http://myhost/site/myfile.php?file=141 BAD

So if you’re serving files from a database via an application, you’re out of luck no matter what headers you send.

Solution

Add a filename and additional question mark to the end of the URI:

• http://myhost/site/myfile.php?file=141&filename.mp3?

This is made easier if your php file has the filename.mp3 as its GET parameter, as you just tack a ? on the end