Bonus Music Tracks Missing

[StarKits]

I previously had 4 music tracks as bonus content with my game and they seem to have disappeared... Has anyone else noticed this? I wonder if it happened with last update by mistake... Seems a bit odd though... I tried deleting and reinstalling afterwards and the bonus folder was no longer there (I checked it beforehand and it was empty anyway)... Ah well, it's not a massive issue, but to be safe I think I'll back up my other bonus content >_>;