What is Mac OS 0.x (1.0 pre-release)? Those are single sided (400KB) disk images of Mac OS 1.0 pre-release, which cannot be mounted on anything else than an early B&W Macintosh or Mini vMac (it will NOT mount on a PPC or Intel system at all).

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128k-guided-tour.img: This is the very first Macintosh 128K guided tour floppy disk from January 1984 (bootable in Mini vMac) - System 0.97, Finder 1.0.img: This is Mac OS 0.97 pre-release from January 1984 (bootable in Mini vMac) - System 0.85.img: This is Mac OS 0.85 pre-release from January 1984 (this crashes Mini vMac at the time of this writing) Download Mac OS 0.x (1.0 pre-release) for Mac.