Confirmed as fixed. Here is my modified versionĀ  Func _GUICtrlTreeView_ClickItem64($hwnd, $hItem, $sButton = "left", $bMove = False, $iClicks = 1, $iSpeed = 0) ;~ https://www.autoitscript.com/forum/topic/198379-_guictrltreeview_clickitem-issues/?do=findComment&comment=1480466 If @OSArch <> "X64" Then Local $iResult_temp = _GUICtrlTreeView_ClickItem($hwnd, $hItem, $sButton, $bMove, $iClicks, $iSpeed) Return SetError(@error, @extended, $iResult_te