The fact that you could take any compiled, commercial app (or game) and thanks to the magic of the "resource fork" (a separate structured-data stream that every

The fact that you could take any compiled, commercial app (or game) and thanks to the magic of the "resource fork" (a separate structured-data stream that every Mac file had), you could edit all its visual assets in this tool... it was just godlike fun education for teen nerds like me