If you're like me, you might still be in the middle of playing ToMI when the Mac release came out, and want to transfer your in-progress games from Windows to MacOS. Or just copy them for any reason.
If so, you seem to be able to copy the Save Game files from/to these locations:
Windows: \My Documents\Telltale Games\
Mac: /Library/Telltale Games/
For example, on Windows, the directory might be C:\Documents and Settings\Cacafuego\Telltale Games\Launch of the Leviathan\ , and in MacOS, it may be /Users/Cacafuego/Library/Telltale Games/MonkeyIsland101.
Note that the Game directory name on Mac depends on the name of the Game application on your system. If you renamed "MonkeyIsland101.app" to "TOMI - Launch of the Leviathan", thn the saved game directory will be named differently as well
Just copy all of the files (not just *.save) from one directory to another.
Note - you may experience some graphics glitches after doing this, as your graphics settings from Windows will be preserved as well. In most cases the problem should go away if you simply open settings inside the game and re-apply graphics settings. However, this has not been heavily tested, and you may experience any number of different issues (including possibly a system crash, though there have been no reports of that yet).
If changing the graphics settings doesn't work, or can't be done, then delete the "prefs.prop" file that you copied. This will reset settings, and will be recreated next time you start the game. However, this will reset the names, dates, and descriptions of all your saved games as well (though the saved games will work, and any NEW saved games will have all the right info).