; www.autoitscript.com/forum/topic/124460-how-to-disable-context-menu-item-in-windows-7/

#NoTrayIcon
#Include <SendMessage.au3>
#include <File.au3>

Opt("SendKeyDelay", 0) ;
Opt("SendKeyDownDelay", 0) ;
Opt("WinWaitDelay", 0) ;
Local $iCountLines = _FileCountLines("Disable.txt")

Global Const $MF_BYPOSITION = 0x0400
Global Const $MF_GRAYED = 0x1

while 1

    $wnd = WinWait('[CLASS:#32768]')
    $hwnd = _SendMessage($wnd, 0x01E1)
    $MenuCount = GetMenuItemCount($hwnd)
    Local $i = 0
    Do
        $i = $i + 1
	    Local $itemtext = FileReadLine("Disable.txt", $i)
    For $x = 0 To $MenuCount
        $text = _GUICtrlMenuGetString($hwnd, GetMenuItemID($hwnd, $x))
        IF StringReplace($text, '&', '') == $itemtext Then DllCall("User32.dll", "Int", "EnableMenuItem", "HWND", $hwnd, "UInt", $x, "UInt", BitOR($MF_BYPOSITION, $MF_GRAYED))
    Next
 Until $i = $iCountLines

WEnd

Func GetMenuItemCount($hMenu)
    Local $nCount = DllCall('user32.dll', "int", "GetMenuItemCount", "hwnd", $hMenu)
    Return $nCount[0]
EndFunc

Func GetMenuItemID($hMenu, $nPos)
    Local $nID = DllCall('user32.dll', "int", "GetMenuItemID", "hwnd", $hMenu, "int", $nPos)
    Return $nID[0]
EndFunc

;http://my-autoit.googlecode.com/svn-history/r29/trunk/Scripts/MkCabSFX/Includes/GuiMenu1.au3
Func _GUICtrlMenuGetString($GMS_hWnd, $GMS_id, $GMS_Opt=0)
  If $GMS_hWnd <= 0 Or $GMS_id < 0 Then Return 0
  Local $MF_BYCOMMAND = 0x00000000
  Local $MF_BYPOSITION = 0x00000400
  If $GMS_Opt = 0 Then
     $GMS_Opt = $MF_BYCOMMAND
  Else
     $GMS_Opt = $MF_BYPOSITION
  EndIf
  Local $GMS_r = DllCall("user32.dll","int","GetMenuString", _
                   "hwnd",$GMS_hWnd, _
                   "int",$GMS_id, _
                   "str","","int",0, _
                   "int",$GMS_Opt)
  If @error Then Return 0
  $GMS_r = DllCall("user32.dll","int","GetMenuString", _
                   "hwnd",$GMS_hWnd, _
                   "int",$GMS_id, _
                   "str","","int",$GMS_r[0]+1, _
                   "int",$GMS_Opt)
  If @error Then Return 0
  Return $GMS_r[3]
EndFunc