Hi !
For .pyz files, pzip don’t want to zip .pyz files and punzip to unzip .pyz files, only .py files 
(I think it is just a renamed .py file…).
And, for tests, i have tried to unzip the Phase2.pyz with punzip, but thats unzip it into a file (not a folder :/).
edit : pzip zip only 1 file, and not a folder (he can’t read it) or several files. So I think .pyz files contains several files, but how can I do this ?