Cant you just click on more apps then scroll down to look for another app on this pc?
What build do you have? I just checked mine and with a jpeg and I get the options of Paint, Paint3D, Store, and choose another app. This is with build 15063. If you are running the latest and still have the issue, there are freeware programs that let you play with this too:
http://www.thewindowsclub.com/remove-click-context-menu-items-editors
What happens if you right click on an individual file? For example if I right click on an .mkv file I then get the option to look for another app on my pc and can navigate to mpc-hc.exe. If I check the always use this app box then mpc-hc becomes the default for .mkv files.
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