What is the proper file name format which allows an imported zip file to display correctly in the "Your Karaoke List?"  I have seen other posts on this subject but haven't quite found the answer. 

I understand your reasoning behind having a way to purchase songs within the program itself, however, if I am unable to sing the songs at the default key the song is played back in - it does me no good to purchase more songs.  My point is that you should develop the player first and foremost.  A key changer is of utmost importance in my opinion.  If you have the best karaoke player you will win hands down in the end!  Its like having an old LP record player and trying to play CD's on it...  You have a great start but I think you're getting the cart before the horse.