In article < XXXX@XXXXX.COM >,
Give a folder a custom icon and look with a a tool like ResEdit,
Resorcerer, or the "ls" command in Terminal, and you'll see a file in
the top level of the directory named:
for most folders with custom icons.
Volumes are different. As for the Application, Home, and other icons on
the left bar, the Finder pattern matches on a set of names and provides
those icons itself. Look in: