The wav files are included in another zip file contained in the Katherine Stone – Prophet X 9000ft Piano.zip;
So the contents of ‘02. Pianobook|9000 Foot.zip‘ need extracting.
they are here on my pc;
Katherine Stone – Prophet X 9000ft Piano\The 9000ft Piano\px\u00\13 Piano\02. Pianobook_9000 Foot\
That folder also contains a file named; 02. Pianobook_9000 Foot.grp
I’m guessing that’s the PX file format that you load..