I call this one of my "monkey methods" (it works for me but probably is not the most popular way of doing it:
Go to your images, sort by file type , right click on one, like the first jpg for example, change what you want to open that type with... scroll down your list of things you can open it with. You wil be given the option to "Open all these type of files with this other program?"
My second image is not complete- I have about 25 other programs that can open JPG images for example.
Thank you so much Glen. It was so annoying that APE took over my files. As like you I have various other files I work with. Thank so for your time and of course the solution that worked fine. Cheers Colin