Hey Ben,
It seems taking ownership of the file should work. I am not presenting a fix, but rather a work-around.
Normally such things are against my personal beliefs, but since it has been 3 hours since your post and nobody has reponded, here we go.
First, try editing the ID3 tags using a third-party program, such as
MP3 Tag. If that does not work, your files are wacky.
Try converting them into mp3s again. I know it seems pointless, as they are already mp3s, but in the process, you will create new files with the same musical data. I recommend
Pazera Free Audio Extractor for your purposes.
Hope it works,
~Jonathan