Search:

Lets make this easier. Right click on an image...select "Open with " (right arrow)...go to the bottom where it reads "Select default program".

The list of accommodating programs will pop up...or...

I think what you need to do is, for example, if you are viewing .jpg files, make the desired program the one you want to use as the default for that file extension. It's very easy to do, but rather...