Speaking of ResEdit, does the resource fork still exist in modern MacOS incarnations?
I still remember that I used to rip the graphics of Escape Velocity (Nova) by simply copying them out of the resource fork of some file (was it the executable itself?).
I also remember that my teenage self had a hard time writing a utility that copied files over a network, since I had trouble serializing the resource fork (or coming up with the idea of serialization).