File extensions keep reappearing
I have checked and unchecked the "Show all filename extensions" box in Finder preferences. I have checked the "Hide extension" box in the Get Info window multiple times, but every time I save, my .docx and .xlsx file names reappear. When I reopen the Get Info window, the "Hide extension" box is no longer checked, and I really, really don't want to have to check that individually for every file I create anyways. What is going on? How can I actually hide all my extensions? Is there some deeper level of advanced preferences or some hidden setting that is making these particular file names reappear every time I save or copy a document?
Other filenames, such as .pdf and .key are perfectly well-behaved and stay hidden like they are supposed to. I do have an older version of Microsoft Office (2011). Perhaps that has something to do with it?
MacBook Air 13", 10.14