Doesn't Photoshop installer set that up on you mac. I believe it should. I use windows and The installed set Photoshop the default foe Jpeg, Did you remove a Photoshop version after you install the latest Photoshop version. That may have messed with your Mac File type application association. I have seen that on windows so I do do not use Adobe's uninstallers to remove version of Phoroshop on Windows I just delete them. Then windows registy is still set up for the newer version of Photoshop.