Update:
In WineBottle give the Identifier a name like com.pg.powertracks as it goes
in User/Application Support/com.pg.powertracks.
To get your BB track into PowerTracks Export then then give the a simple name like Drums, Fiddle etc..
You can save files to User/Application Support/com.pg.powertracks/drive_c/pt/songs, as PowerTracks will open in the pt folder.
1. Save your BB song again as song-powertracks.SGU then after save rename to MGU.
2. PowerTracks File > Open song-powertracks.MGU (this will give your chords).
3. Now select the first track > File > Import > Bass.WAV, next track Drums.WAV etc..
4. You can Import the RealCharts Midi as well, in RealTrack Prefs check Save RealCharts in Midi file/BB Song MGU
5. File > Save Special > Midi > File on Disk.
6. PowerTracks File > Import song-powertracks.MID ** Don't import Chord from the Midi file !!!