I have a user who is no longer able to double click or right click on a .jpg or jpeg attachment in Outlook 2010 and have it open in photo viewer (default setting for these file types). I found that if she right clicks on the attachment and selects "preview" and lets the preview screen open and THEN select "open" the attachment opens in photo viewer ok. She can also save the attachment to her PC and it will open with the default application. I have checked the default settings for the file types which are set correctly.
This is a weird one for me. any ideas please?