Windows media streaming via the Silverlight framework is classified as HTTP.
Windows media streaming may be filtered out of HTTP with the following class definition:
class new /Inbound Silverlight inside TCP service:client outside service:HTTP "web:content-type:video/x-ms-wmv"
class rule add /Inbound/Silverlight inside TCP service:HTTP outside service:client "web:content-type:video/x-ms-wmv"
class copy /Inbound/Silverlight /Outbound