IIS6 Known Extensions feature

Yesterday I ran across this issue when a user of our IIS6 hosting service reported that their Authorware applications were giving timeouts when using the latest 2004 player. The server logs were showing 404 response headers whenever the .X32 files called by the player were requested. Evidently if IIS6 gets a request for a resource whose file name extension is not mapped in the MimeMap property, IIS denies the request and logs a 404 error. This issue and further info on how to work around it is documented on MSDN