Whenever I have inserted a cd in a drive and selected explore, I have been able to see the file type. I bought a cd, karaoke style -- for all practical purposes here -- and when I inserted the CD I only found pdf files which hold the sheet music. I always make a copy of these cds in case one becomes damaged. On two computers I was completely surprised that I could see nothing except the PDF files. Is there a way to see the music files?