if its an sgu or mgu file the style will load automatically. if its a midi or wav file produced from the original BIAB track that's more difficult. maybe try loading it and using ACW to produce a chord sheet. mute the audio and then use stylepicker filters to find styles of the same tempo, swing or straight 8ths or 16ths and set the genre - country jazz etc.

audition each of the styles using the song chord sheet and listen to see if you recognize the style. but it could be a long process!