Would it be possible to stick in a live-cd of some version of Linux and install an HFS driver and go into the control panel folder (or extensions) and get rid of or move the appropriate file and boot? Or you could find a Linux Mac emulator and stick that control panel into it change it and put it back. Booting with extensions off? Though I'm just estimating and thinking up ways. You could just bid on a Mac OS 9 disk.