So the Finder’s Compress command (File menu or contextual menu) creates Zip archives (.zip), but the Archive Utility app defaults to creating compressed archives in .cpgz format. That’s a thing I learned from this nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqna9z28fchmnc3y3rvdy9fsccgppupmfk7ckamc6haml9v7d0pqzswtz7vu (nprofile…z7vu) story:
https://sixcolors.com/link/2025/01/compress-folders-into-separate-archives/
Why the Finder uses good old .zip is obvious: it’s universal.
But why in the world does Archive Utility default to this bizarre .cpgz GNU archive format? It’s not like compression is better (if at all). Anyone know? Or have a good guess?