Word can't open its own files

Suddenly clicking on a .doc file results in Word reporting that for security reasons it cannot open .doc files.

I guess that's one way to ensure security.

 

Yes, I've installed all of the updaters.

It appears that the document itself was corrupt, (caused by Word crashing a short while ago while opening it). When I restored the document to yesterday's version using Time Machine and double-clicked it, it opened just fine.

What a great product...