Library Icon of Windows

In the all operating system Windows have storage some quantity icons. These icons haven't extension .ico that is storaged in some file special of Window that have extension .exe, .cpl, .dll.
So, in frame Look for icons in this file of dialog Change Icon, you can declaire location:
+ C:\WINDOWS\explorer.exe or explorer.exe: icons have relate to Windows Explorer and desktop.
+ C:\WINDOWS\system32\main.cpl or main.cpl: icons have relate to Control Panel and mouse applet.
+ C:\WINDOWS\system32\shell32.dll or shell32.dll: other icons ...