[Zope] create objects with dot in product

[Tim]

Via the ZMI i can create an object with a . in the name (for example,
an object with an id 'file.htm'); how can this be done in a disk based
product? For example, the following obviously won't work:

file.htm = PageTemplateFile('www/file.htm', globals())

There must be a trick, since the ZMI can do it?