原文

http://www.heerengandhi.com/2009/07/29/firefox-icon-went-missing-in-windows-7-heres-a-fix/

照著做之後，Windows 7下的Thunderbird的圖標就恢復正常了。

轉貼如下

HOW TO

JULY 29

Firefox Icon went missing in Windows 7? Here’s a Fix

After installing the latest and greatest Mozilla Firefox 3.5 in Windows 7 (RC 64-bit) I noticed that after a while the icon went missing. Now Firefox was still working correctly, and when I checked the icon properties the icon was still present. But for some strange reason it wouldn’t show up in on my Desktop, my Start Menu, or my Taskbar, I would just see a broken icon.

The resolution? Rebuilding the Windows 7 Icon Cache.

Follow these directions:

Close all folder windows that are currently open.
Launch Task Manager using the CTRL+SHIFT+ESC key sequence, or by running taskmgr.exe
In the Process tab, right-click on the Explorer.exe process and select End Process
Click the End process button when asked for confirmation.
From the File menu of Task Manager, select New Task (Run…)
Type CMD.EXE, and click OK
In the Command Prompt window, type the commands one by one and press ENTER after each command:CD /d %userprofile%\AppData\Local DEL IconCache.db /a EXIT
In Task Manager, click File, select New Task (Run…)
Type EXPLORER.EXE, and click OK.

Your icons should be as good as new!