Windows 10 also still has this. There's also a keyboard-shortcut to open the menu: Alt-Space. To open the same menu in a child window of an MDI application, use

Windows 10 also still has this. There's also a keyboard-shortcut to open the menu: Alt-Space. To open the same menu in a child window of an MDI application, use Alt-- (Alt-Minus). Which was intuitive in the windows 3.0 days because the icon of the top level window was slightly longer (like the space bar) than in the MDI child windows (like the minus sign).