[Zope] How to upload files and create file objects from DTML page?

I want to have a normal DTML page for users that allows them to upload and download files (without needing to use the management interface). The downloading and display of files is fine, but I cant figure out the zope/python code to create a new file object and store an uploaded file. The files could be upto ~60MB in size, and can be zip or doc files etc. Has anyone seen suitable sample code for this?