If not support to check for updates function, not display the menu item named "Checks for update" on Classic GUI and on Explorer window.
如果不支持检查升级功能，在经典GUI界面和浏览窗口界面不显示“检查升级”的菜单选项。
A check mark appear next to the menu item when the status bar is display.
显示状态栏时，紧靠着菜单项出现一个复选标记。
A check mark appear next to the menu item when the status bar is display.
显示状态栏时，紧靠着菜单项出现一个复选标记。
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