Problem with Word opening all emailed pdf's in Edit mode

[madden66]

A while back I was trying to edit a word doc on my pc and must have made some changes inadvertently. Basically what is happening now is anytime I receive an email with a pdf attachment Word is trying to open it up in Edit mode. I have found advice online on how to open docs in edit mode all the time but haven't found anything to reverse the process. I did check the Trust Values in Word and all my settings appear to be correct for read only view. Any help with this is appreciated. Thanks....