Every so often the default viewer for PDF files gets changed to iBooks. I want PDF files to be opened with Preview, and I want that setting to persist.

I know how to manually change the default back to Preview (by going to the file in Finder and then clicking Get Info > Open With > Change All). However, at some point after I make the change, the defaults gets switched to iBooks again. Is there a way to prevent that from happening, and lock the default PDF viewer to Preview?


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