Hi Just to say I get the same error message when trying to open MSWord documents from within File Explorer. I have done a google search (which is how I found this, and older, threads) but so far none of the suggested solutions have worked for me. For example, there is no "Protected View" option displayed under the Trust Centre settings (a proposed solution from a thread in 2014), nor can I find any templates in the STARTUP folder to delete. I don't believe I have any macros in my default template either.
Any further suggestions would be most welcome as the error is becoming very tiresome!!