How is default pdf to open determined? How to change which opens?

realtime99
I have two pdfs attached to an item. I want to open pdf A rather than B when I highlight the item and type 'enter'. I tried changing the pdf names to change the order they were listed (first/last) and modifying both so both were the most recently modified, but B always opens rather than A. How to make it open A? Thanks.
Sign In or Register to comment.