I have over 1250 .mus files that I've made ever since I first purchased Printmusic 2002. Now, I'm told that to change those from .mus to .musx files, I'm going to have to do it one at a time, saving them to Printmusic 2014.
Not going to happen. For all the advantages that version 2014 may have over version 2010, it's not worth the time to do that. So, I'll stick with version 2010 and I'll likely uninstall/delete 2014 from my hard drive since it's caused complications with 2010 on at least one song that I've done.