Here's how I did it:

Set the .jpg to open with PhotoViewer.dll in "C:\Program Files\Windows Photo Viewer"
Then associate PhotoViewer.dll with rundll32.exe in System32.

In Windows 10, whenever I insert a USB or External HDD, it gives me two listings for it in the Explorer pane:

28184

Is there any way I can remove the second listing? Preferably the standalone...