This function will be called when the Save item of the File menu is selected by the user. If file-menu:save is #f, rather than a procedure, the Save menu item will not be added to the menu.
It is defaultly #f.
![[previous]](../icons/left.gif){kind=icon}
![[up]](../icons/up.gif){kind=icon}
![[next]](../icons/right.gif){kind=icon}
![[contents]](../icons/contents.gif){kind=icon}
![[index]](../icons/index.gif){kind=icon}