mail INBOX parsing script

I am interested in writing a script (or finding) that will parse the ASCII INBOX mail file. I don't know how to handle attachments. How would you take the part of the file that corresponds to the attachment (say, a .exe file) and create the corresponding .exe file? Is there any code that anyone knows of that would give me hints (e.g., emacs's mail parsing code) Any help here would be much appreciated! Thanks, Steve