I recently lost the “Show Desktop” button in my quick launch bar in my Windows XP, and I feel it is very annoying, since I use it very often on my computer. To re-create it is not very obvious, and I think it is good to keep it for future reference, the following was what I did to restore the “Show Desktop” button:
1. Open any of your favourite editor, my personally preference is Vim.
2. Type the following text on individual lines:
3. Save the file under your desktop and name it “Show Desktop.scf”.
4. Minimize all your windows and back to desktop, drag the new file you just created and move it to the quick launch bar.
You are done.