I have an issue when starting Excel with the following code #include <Excel.au3> #include <GUIConstantsEx.au3> Opt("GUIOnEventMode", 1) GUICreate("Excel Test", 600, 440) GUISetOnEvent($GUI_EVENT_CLOSE, "MenuExit") GUISetState(@SW_SHOW) ; Create application object Local $oExcel = _Excel_Open() If @error Then Exit MsgBox(0, "Excel UDF: _Excel_RangeFind Example", "Error creating the Excel application object." & @CRLF