I feel your pain here.....
1. I got lucky with the Xeno's sound banks......When I unzipped them I seen that issue plus the fact that it unzips and has a few extra layers (folders) before you get to the actual patches....I I just made a new folder and then dragged what I needed into this new folder and then copied these into the Z3ta+2 programs folder......worked right out of the box....
HOWEVER....
2. When I select a Xenos patch it plays fine but then try to modify it using the arp I get no sound....Z3ta+2 will not speak again until I change patches.....
I do not have a clue as to why this is.....
The factory content allows me to use the arp section but not the Xenos patches....Weird....
Clifford