An employee who frequently receives emails with PDF attachments receives an error message ("can't create file: xxxx.pdf right-click the folder...") in Outlook every 4 months or so. The first time it happened I found an article that stepped me through locating the "OutlookSecureTempFolder" via regedit, and then deleting the temp files from that folder. This has worked like a charm for a year or so, but not today. I found a tip someone else had tried (changing the registry value for the Outlook tmp folder to a different folder on your hard drive) that worked for them, but no go for me. The user can open other PDF attachments on emails but the ones named "attachment.pdf" get this error. I think the sender is scanning these docs in and the scanner is automatically naming them "attachment.pdf" everytime. The user gets these emails with the "attachment.pdf" from a coworker who forwards them to her on a daily basis. It occured to me that perhaps the name of the PDF was presenting a problem, so I saved a copy of the PDF on the coworker's PC, then renamed it and attached the renamed file to the forwarded email. The user can now open that attachment. Since the user had been able to open these attachments named "attachment.pdf" before today, and the coworker who initially receives then forwards them does not experience this problem, it makes me think that the name of the file is only a part of the problem.