I'm running Windows LiveMail 2012 Version 2012 (Build 16.4.3528.0331) and Acrobat reader DC.

I can't open PDF attachments, that I had no trouble with previously.

When I double click the attach., or right click & select Open, nothing happens - no error message, nothing.

I can open ordinary PDF files OK.

I successfully updated Windows 10, this morning, with the Annniversary upgrade, but that didn't resolve it.

Can someone please help?