Before you can use, or to deny the use of, an HTTP request handler that is not in the list of Web service extensions, you must first register it by adding the HTTP request handler to the list of Web service extensions.
|To add a new Web service extension|
In IIS Manager, expand the computer name, and then click Web Service Extensions.
In the details pane, click Add a new Web service extension.
In the Extension name box, type the name of the new Web service extension.
In the Path to file box, type the path or click Browse to navigate to any files that the new Web service extension requires, and click OK.
Optionally, select the Set extension status to Allowed check box to automatically set the status of the new Web service extension to Allowed.