Hi Peter,
By default, DirectoryListingModule take precedence over UrlMappingsModule. Fortunately, it is possible to change the order of UrlMappingsModule and DirectoryListingModule.
Goes to IIS7 Manager -> Modules, in the right pane, click View Ordered List, you can then use Move Down, Move Up to change the order of modules.
Zhao Ji Ma
Sincerely,
Microsoft Online Community Support
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