Since it’s a proprietary format, there’s no (native) way to read these attachments for the e-mail receiver, unless he’s using Outlook aswell. Why should we do such a thing? The answer is based upon our previous post. Now we’ll approach the same issue from the other side, seeing how we can configure Outlook to stop sending its attachment files using the Winmail.dat. We already talked in this post about the Winmail.dat file, which is part of the proprietary TNEF format used by Exchange and Outlook to encapsulate attachments files, notes and meta-data inside mail messages: the main focus there was figuring out how to open these files when we receive them to other, non-Microsoft e-mail clients.
