This issue was driving me insane... all of my jpeg, png, tif files were opening in Illustrator regardless of how many times I chose PS 2018 as the default application under info >>> other. This was happening with both my work computer running Sierra (but not on others in the office) and my home computer running El Capitan. I ran the terminal command joe.pagan offered above and that solved this irritating issue. Thank you! Not only did everything that should be defaulted to PS 2018 become so, but the list of programs under "open with" also returned. Here's Joe.pagan's command line again: /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Supp ort/lsregister -kill -r -domain local -domain system -domain user; killall Finder
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