Hi wbishop,
I had the same problem a few months ago and Muckshifter's advice did the trick for me. It was:-
Microsoft did, some time ago, tighten up how an "attachment" in an email may be opened ... they simply closed the door on them.
Check under the Tools / Options menu, and click on the Security tab. There is a check box that reads Do not allow attachments to be saved or opened that could potentially be a virus. Uncheck that box and try to re-open the message. You should be able to view the attachment
It might be worth a try.
Best of luck.