I am using a mac.
I edited a module by renaming it with .zip.
Then compressing the folder with Mac compress utility, replacing .zip with .vmod
VASSAL keeps on telling me its is not a valid VASSAL module, with both open and import functions.
I tried compressing the folder from a Windows Virtual machine. Same behavior.
At the end I needed to instal 7zip in Windows, then I archived the folder content in a zero compression archive in a zip format.
Any idea what is wrong with my Mac compress utility ?