https://bugs.winehq.org/show_bug.cgi?id=43137
--- Comment #17 from Ryan Farmer rfarmer84@outlook.com --- According to Fedora's Bugzilla, a version of Wine with MP3 support (through mpg123) was pushed to stable repo for Fedora 25 on December 3rd of last year.
https://bugzilla.redhat.com/show_bug.cgi?id=1395711
So yeah, it has supported MP3 for a while on Fedora.