[Zope] Accessing File Contents

I have a Zope application that stores entries in Zope file objects. I know how to create the objects, storing text as the file's contents and know how to read and update the objects properties from a script called on the object. But, I don't know how to access or update the file's contents from such a script. So, I've stored all my data as properties. I'd appreciate help in accessing and updating the file object contents from a python script called on the object in Zope. Thanks, Tom Nichols tom@westlong.com