Another thought too - what exactly are those zipped files...
Each one could be a set of files recorded on another Technics machine and specifically for use in the KN7000 with a sequenced version for you to listen to.
Each one could be a zipped up mp3 that can be played through a KN7000 if you know what you're doing with SD Jukebox.
They could each be zipped files of a song being played on another make of keyboard completely which could be very challenging for a KN7000 owner...
Hopefully it's the first option.
Rog