I have not seen an answer yet to the question of whether those of us who have BIAB2009 for Windows and all the realtracks and realdrums for the PC version can use those same real files with the MAC version. I am interested in getting the MAC version as I own 2 macs but I do not wish to purchase all the real files again when I already have them for the PC. Is it a license/usage issue or just a file format issue?