Thank you for the information, I didn't realize that. Limiting in what ways, exactly? What can .mc6s do that .pz2s can't?

Edit: I ask because I've made .pz2s from .mc6s and the only thing really required was saving them as a different file format, and the results seem identical as far as I can tell. I don't understand how a .pz2 wouldn't be able to have the same features as an .mc6.