I have a folder with about 20 Numbers files that I have created over the years. I have all the files marked to NOT show the extensions. Also have the Finder Preferences configured to NOT show extensions.

This morning almost all of the files show the .numbers extension. I have toggled the Finder Preferences to no affect. If I do a 'Get Info' on a file the hide extension box is checked but grayed out so I cannot access it.

Interestingly, if I duplicate the file, the duplicate does not show the extension and the high extension box is checked, as it should be, and accessible.

Have now discovered that all JPG files and some, but not all PDF files, have the extension showing and toggling the Finder Preference does not change this. So far word processing file do NOT have the extension showing.

Have deleted the Finder .plist logged out and logged back in with no change.

How do I fix this? Thanks in advance.

Last edited by alternaut; 06/12/18 06:43 PM. Reason: Thread moved from ‘Mac OS X Applications’ to ‘Mac OS X System’, which is a better fit for the topic.