If I sort by filename using ID3 Tag Editor it sorts like this:
01-armed and ready.mp3, folder=MS
01-arnold layne, folder=PF
01-back in the ussr, folder=BB
If I sort by filename using Music Studio it sorts like this:
01-poison arrow, folder=80s
02-lets dance, folder=80s
03-love shack, folder=80s
Notice how Music studio sorts the files differently, grouping by folder name.