This is the icon for the ImageMapper program
(shown on the Desktop for convenience).
Dragging any image file onto this will open a
window, where you can use the mouse to specify
the rectangular areas you wish to form the link map.
In our example case, dragging the image file onto the icon
will open a window (something) like this — except in the current version
there are scroll bars, and the window doesn't try to auto-resize itself:
Onward...