Italophile - OMG. Now I really feel like an idiot. I have never actually opened or saved a document in Compatibility Mode before, as I have never had a reason to. So, I didn't even look close enough to see that is what this was.

As I have gotten older the 'fat-finger' syndrome has become far too prevalent, and I must have added an asterisk before the file type accidentally.

Italophile and Charles Kenyon, thank you so much for the assist. I'm going to go hide under my desk for a while now...

How embarrassing! LOL