However, there is a it took me several hours to figure out how to do it on other windows in runtime, so I tought it might help others. So you want to remove buttons like this: #include <WinAPI.au3> #include <Constants.au3> #include <WindowsConstants.au3> $h = WinGetHandle("Untitled - Note") $iOldStyle = _WinAPI_GetWindowLong($h, $GWL_STYLE) ConsoleWrite("+ old style: " &amp;amp; $iOldStyle &amp;amp; @CR) $iNewStyle = BitXOr($iOldStyle, $WS_MINIMIZEBOX, $WS_MAXIMIZE