Thanks Joel!
Viewing post in Modern Day Music Mini-Pack comments
Resolution to the mystery: I may not have intended to include War Room in the pack, as it was supposed to be 5 tracks, 5 ME for $5, but I'm listing it as a bonus track and now the download has both the .m4a and the .ogg in it, giving the pack six total music tracks.
So, you and anyone else can just re-download to grab the .ogg (which loops better than if you were to make an .ogg of the .m4a)