Ditto.... My PC used to do this automatically, but will now only open PDF files after I save them, find them in some arcane location, then open them.
I assume that some "upgrade" from either Microsoft or Adobe has stopped this functionality for some reason, but I can't see why or how.
PDFS were fine on my PC until a few months ago, when they just stopped opening.
If anyone knows the fix for this, I'd be grateful as well.
VP