Update: Another possible and maybe easier way is:
◘Make a shortcut of MPQtool.exe
◘Right clic on it, select properties, then in the path window, add this:
-e "C:\Program Files\Burning Crusade F&F\Data\patch.MPQ"
(Yes, there is a space between ...MpqTool.exe" and -e"C:\...)
◘Apply the changes, press Ok, and launch the shorcut.
Example:
Let's say that you installed MPQtool in the c:\MPQ folder, it will look like this:
"C:/MPQ/MpqTool.exe" -e "C:\Program Files\Burning Crusade F&F\Data\patch.MPQ"
Hope this helps.