Vehicle banks in a map pack.mjolnir map pack reads the banks from the .pak
beside a container and writes them as content/<container>/<id>.bnk. The archive
itself never holds a .pak, and the launcher builds one when it installs the map.
Changed
A pack stops on a bad bank.map pack refuses a .pak holding any other file, a
bank the game ships, and a bank whose header doesn't match its name. These are the
rules the hub and the launcher apply.