Use Finder/etc in OSX Tiger or higher to read disk images of the
prehistoric MFS (Macintosh File System, circa 1984-1986). This
download is the zip file, exactly as it appeared on Apple's developer
website, including source code and documentation. Within, the package
file/folder named "build/Debug/MFSLives.fs" is the ready made software
we're interested in (you could ignore the rest). An alternative to
MFSLives would be to simply make use of Mac OS 8.1 or earlier because
MFS was accessed natively in those days.

One example MFS disk image is the garden's "[Through the Looking
Glass][1]" -- failure-to-mount is the best you can do without MFSLives
as seen here in Screenshot 2. But with MFSLives, Screenshot 1 shows
Tiger Server 10.4.11 gaining access to Through the Looking Glass
image. Its volume (named Games) declares that its file system format
is "MFSLives!" in its Info window.

To install, drag (only) the "MFSLives.fs" software into
/System/Library/Filesystems
There's no need to reboot, but you must repair permissions.
The minimum repair is via Terminal:
"sudo chown -R root:wheel /System/Library/Filesystems/MFSLives.fs"

For easy access to ".dsk" image files such as "Through the Looking
Glass.dsk",
rename that file extension from ".dsk" to ".dmg"
then double click on it to mount it to Desktop.

A better way to archive ".dsk" images in an historical library is to
not rename; keep that dsk suffix to indicate the file is an old image
of a floppy disk. Then, to make ".dsk" images mount when double
clicking them, use a utility such as "Filetype 101" to set the dsk
file's Creator and Type codes to "ddsk" and "DDim" respectively.

MFSLives provides read-only access; writing in the MFS format isn't
implemented.

Compatibility
Architecture: PPC x86 (Intel:Mac)

Requires at least OS X 10.4 Tiger.
"MFSLives.fs" tested works in Tiger and Leopard too.
It does NOT cause the computer to perform slower.
Needs to be tested in OS X >= Snow Leopard.
I haven't tried manipulating the source code.

  [1]: http://macintoshgarden.org/games/through-the-looking-glass-aka-alice

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