The "zip" wasn't a compression format. It was a spatial coordinate.
I wouldn't recommend downloading or promoting files with those extensions ( Combining those two formats is a major red flag for goldstein classical mechanics solutions chapter 5.zip.iso
While searching for a specific file like might seem like a shortcut to mastering rigid body dynamics, the journey through Herbert Goldstein’s Classical Mechanics is as much about the process as it is the answer. The "zip" wasn't a compression format