[Zope] Read a temporary file and send it as a attachment

Hello, i have a pdf file (or more), that sends data in the fdf-format to my zopeserver. When i request the body i get the fdf-file in my browser. With the request bodyfile i get the name of a tempfile. Now my problem: How can i "take" the bodyfile, modify the file to xxx.fdf and send it per Email? Please help me Thanks Christian