.net Remoting (XMLRPC) Webservice

I have a webservice with XMLRPC methods running on IIS 5 and IIS 6. check the following URL

http://cxpakistan.com/GSKHelper/GSKLiveSearch.rem

This service with .rem URI works just fine on these versions of IIS, however when I try to call this .rem URI on IIS 7 it gives me this error:

System.Runtime.Remoting.RemotingException: Requested Service not found

The .asmx URI works just fine for the same webservice on IIS 7 but .rem gives me the above error, but works fine on IIS 5 and 6.

I have been looking for help for the last 2 weeks on the web but no luck so far. Any help will be appreciated. 
As far as I know it is some problem with httphandlers in web.config file. Seems like there is some extra configuration I have to do for IIS 7. 
Please check out my web.config file.

Thanks for the help in advance.