[Zope] Question about dot in method name

hi every body i'm changing a very old zclass product. In this zclass i declare a python script with this name "mydoc.xls" this script return an xls file with an argument now i'm writing a zope2 product. How can I explain to zope that he should publish a certain method with a different name so when people type http://myIntranet/folder/mydoc.xls?fileName=hello.xls it point to a real python method (dot caracter are forbiden in python class method) mydoc.xls => mydoc_xls(REQUEST=None) I know that Zclasses are bad :), but I cannot change this URL, because lot's of people record it. thank's a lot for an advice.