Working as a consultant, I constantly receive Win attachments from clients and, every now and then, one of these "winmail.dat" files. If there is only one content item I can usually open it by experimenting with suffixes but if there is even a corporate logo in the content as well as the file that matters, I have been condemned to frustration; until now. TNEF's enough does what it says, meaning problem solved. What more could you want?