.ICL File Extension
File TypeWindows Icon Library File
This file is saved in a binary format, which requires a specific program to read its contents.
What is an ICL file?
To change the icon of a file, right-click the file, select "Properties," and click the "Change Icon" button. You can then browse to an ICL file and view the available icons in the library. If you find an icon you like, you can select it and assign it to the file.