Thread:Extension talk:TimedMediaHandler/How to enable MP3 support?/reply

That format is not a priority for this extension (The primary goal is to support a/v formats used by Wikimedia. For political reasons its very unlikely Wikimedia will be using this format)

If you put the following at the bottom of LocalSettings.php, it might work, no guarantees:

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You may want to consider something like mw:Extension:Mp3Handler