NILIf you ever receive a mail with an attachment named "winmail.dat" then
you may be disappointed. It is a special format used by Microsoft
Exchange, it contains the files attached to the mail and need some
specific software to extract them.
Hopefully, there is a simple and effecient utility named **tnef** to
extract the files.
Install it: `pkg_add tnef`
List files: `tnef -t winmail.dat`
Extract files: `tnef winmail.dat`
That's all!