Somewhere in outlook they get automatically created when forwarding email messages and Mac users have long wondered what they are and how to open them. Winmail.dat files come from those Microsoft Outlook or Exchange programs and are some sort of archive method.
TNEF’s Enough is a little freeware application that can open winmail.dat files and extract the attachment that is inside. Good news though, you can open that file. However, the only thing attached is a winmail.dat file.
Someone will send you an email and tell you to check out the attachment.
