#SingleInstance Force

SetTimer, RunBeforeShutdown, Off
DllCall("kernel32.dll\SetProcessShutdownParameters", UInt, 0x4FF, UInt, 0)
OnMessage(0x11, "WM_QUERYENDSESSION")
Return


WM_QUERYENDSESSION(wParam, lParam)
  {
    static sdtry = 0
    ENDSESSION_Logoff = 0x80000000
    If (lParam & ENDSESSION_Logoff) ; User is logging off.
      EventType = Logoff
    Else     ; System is either shutting down or restarting. and
      EventType = Shutdown
    If (EventType = "Shutdown" or "Logoff" and sdtry = 0){
      sdtry = 1
      SetTimer, RunBeforeShutdown, On
      Return false ; Tell the OS to Abort the Shutdown/Logoff.
    }
    Else If (EventType = "Shutdown" or "Logoff" and sdtry = 1)
      Return true
  }


runBeforeShutdown:
  SetTimer, RunBeforeShutdown, Off


  If (EventType = "Shutdown")
    MsgBox, Shutdown
  Else
    MsgBox, Logoff


Reload