[Zope] Creating files on server

Hello, I have a problem I don't know how to solve. I am about to create some SMIL-files on my RealServer. We are using Zope as an interface to our Media Portal. We have a database with all attributes in needed to create a SMIL file. Now I would like to - when a submit button is hitted - that a DTML method is called. This method should create a new file with some specifik data in. Now how do I do this ? I have installed the LocalFS but I can't see how this products writes files, except that it uploads them. I don't need to display an upload form - just write a file directly. Regards, Gitte