By Marc:

The .ICL files are ICon Libraries. Technically they are resource DLL's with a renamed file extension. Every .ICL file contains a number of Icons (.ICO) files.

To extract the .ICO files you are interested in, you will need a tool which can read the .ICL fileformat. In fact most of the Icon-Tools can do this (like Microangelo for example).

Anyway: if you like to use icons within a .ICL file for your program-/desktop-icons you don't have to extract them. Just go to the properties dialog of the particilar file and choose Change Icon. Then you can select the .ICL file and you will see all the icons stored in that .ICL file. Choose the one you like and press Ok.