The HOLP303 recommends using VirtualPathProvider, where as two blog posts: http://blog.opennetcf.com/ctacke/2010/02/05/HostingRESTfulWebServicesInWindowsCEPartI.aspx http://blog.opennetcf.com/ctacke/2010/02/05/HostingRESTfulWebServicesInWindowsCEPartII.aspx show how to use HttpHandlers directly, i.e. by deriving from BaseHandler. When would ...