Check the directory where the song is and see what files have been created. Each Performance track should have the part appended to the song name. Example, the bass part for 'MySong' should be 'MySong Bass' etc. The audio file Mac mentioned will be just called 'MySong'.

How did you create those files?

I don't think you need to disable RTs/RDs to play Performance Tracks. If BIAB finds them, the regular part is muted and the audio track takes it's place.