The "Show Desktop" icon has disappeared from Quick Launch

I had a user call in, complaining that her “Show Desktop” icon had disappeared from the Quick Launch bar. She was unable to find it again, and was really distressed as she used it a lot.
 
As it turns out, Show Desktop is not a regular program, but rather an OS command, known as an SCF-file, which according to FileInfo.com is a

Command used by Windows Explorer; for example, to move up or down a directory or show the Desktop; run via Internet Explorer.

 
The solution was simple enough, even though I would recommend that you implement it yourself rather than have a non-technical user implement it. Solving the problem goes as follows:
 

1. Open notepad
2. Enter the following in notepad:
   [Shell]
Command=2
IconFile=explorer.exe,3
[Taskbar]
Command=ToggleDesktop

Save the file as “Show Desktop.scf” in the folder C:\Documents and Settings\username\Application Data\ Microsoft\Internet Explorer\Quick Launch