Windows 7: Firefox 7 Programs' Shortcuts button not working for Windows Defender?

In an effort to duplicate Maxthon's "Add external tool" (allows you to add a program's quick start icon to a toolbar) within Firefox 7, I diligently have followed instructions from the this site: "http://www.inspiredgeek.com/2010/12/06/launch-windows-application-directly-from-firefox-a-retake/". Everything works just fine; left clicking program shortcuts placed within the Shortcut button, calls up the intended program...except in one instance where it fails.

When trying to bring up Windows Defender, I get the following error messages:

First message is from Windows: "Windows can't find C:\Program Files (x86)\FF Shortcuts\MSASCui.exe - Shortcut.lnk . Make sure you typed the name correctly and try again. Don't know why Windows couldn't find the file as it IS correctly placed in FF Shortcuts and is spelled correctly." The MSASCui.exe shortcut was dragged from the desktop (where I had it placed after making it) into the FF Shortcuts folder where all the program shortcuts are stored.

Then the following error message from Java: "Error 2: Component returned failure code: 0x80520012. NS_ERROR_FILE_NOT_FOUND)[nslLocalFile.launch]"

I really have no idea why this is not working for this specific program.