"Open With" ...running application option?
You could just drag the file onto the App icon in the Dock… [which is very difficult to take a screenshot of…]



[after comments…]
Alternatively, you could…   


drag the file onto the app switcher - the one you bring up by pressing  Cmd ⌘   Tab ⇥    


or  


use DragThing which has been a kind of substitute Dock since long before the Dock existed.