DEPRECATED - This is now hosted at https://github.com/Yeraze/ytnef
ytnef is a program to work with procmail to decode TNEF streams (winmail.dat attachments) like those created with Outlook. Unlike other similar programs, it can also create vCalendar/vCard entries from meeting requests, address cards, and task entries.
A method of file compresison where the value of all the binary information in a file as one figure is divided by a number, therefore shirtening the size of the file. To decompress you multiply it by that number again.