Hi In my Win 8.1 the photo (e.g. JPEG format) is opened by XnViewMP. and when I want to view with non-default app. I use "open with" and then click over "Zoner Photo Studio 16". I like a gesture that over a picture icon on Windows explorer, could open with the "Zoner". Thanks again
This is difficult to make specific to pictures. Meaning, S+ doesn't know what your mouse is above, especially regarding the specific icon inside of another program.
I would recommend making an action which specifically opens an item in Zoner. However, it will be a little complicated as you'll have to suspend all input, move the mouse, and send the correct key sequence to navigate to the correct Open With menu item.