I've just started using the Rdio service, and have synced a bunch of songs to my iPhone. I've SSHed into my phone, and located the music files, and then downloaded them to my Mac. So far, so good.

The problem is that I can't identify what format the files use; I've tried appending MP3, M4A, OGG, FLV, and SWF to the filenames, but can't get them to play back on my machine. MediaInfo doesn't provide any useful info either.

I'm quite sure that the files that were SSHed are the music files, since they're all in the range of 4-7MB. Any advice on getting them to play back?