Mouse Click

With the mouse pointer on the main menu word "File", and still grasping the mouse, tap the left button of the mouse.

The drop-down File menu should appear, as if you had used Alt-File.

With the mouse pointer on the word "File", and still grasping the mouse, tap the left button of the mouse to remove the File menu. (You could as easily let go of the mouse and tap the keyboard ESCape key!).