> Mpack and munpack are utilities for encoding and decoding
> (respectively) binary files in MIME (Multipurpose Internet Mail
> Extensions) format mail messages. For compabibility with older forms
> of transferring binary files, the munpack program can also decode
> messages in split-uuencoded format. The mac port can also decode
> messages in split-binhex format.
>
> In short, mpack is the MIME equivalent of uudecode/binhex.
