Magic Mouse Middle Click in Windows 7 64-bit Bootcamp?
I have found a partial solution:

Using AutoIt, an automation software for Windows, the middle-click can be simulated by pressing ctrl-left click using the following script:

#include &lt;Misc.au3&gt;

Global $iFlag = 0

While Not _IsPressed("1B") ;Esc to quit
    If _IsPressed("01") And _IsPressed("11") And Not $iFlag Then
        $iFlag = MouseDown("Middle")
    ElseIf Not _IsPressed("01") And Not _IsPressed("11") And $iFlag Then
        $iFlag = (MouseUp("Middle") &lt;&gt; 1)
    EndIf
    Sleep(20)
WEnd


The script is taken and modified from here: http://www.autoitscript.com/forum/topic/132174-simulate-middle-mouse-click/, which is exactly the same scenario that I am facing. The script can be compiled to an .exe, which I have already done. If anyone's interested, I can share it.

This solution has a drawback, however. It can only simulate middle-clicks, you can not middle-click-drags.