Stand and Deliver
Join Date: Jun 2008
Location: Tampa Bay
Bikes: Cannondale R1000, Giant TCR Advanced, Giant TCR Advanced SL
This is a compatibility problem with Outlook and other email programs. I've seen this problem a few years ago when I was using Eudora for managing email. If you are using a program other than Outlook and receive an attachment with a *.dat extension, the sender was most likely using Outlook and you are not. You will have to contact the sender if there was an attachment.