2.0.2
In Global.asax add a variation on following after 'TitaniumCore.Utils.RouteManager.SetAppRoutes(currentFactory);':
RouteTable.Routes.IgnoreRoute("Posts/Circulars/{file}.pdf"); //for files
//for folders use RouteTable.Routes.IgnoreRoute("blog/{*pathInfo}");
var IgnoreRoute = RouteTable.Routes[RouteTable.Routes.Count-1];
RouteTable.Routes.RemoveAt(RouteTable.Routes.Count-1);
RouteTable.Routes.Insert(0, IgnoreRoute);
Note that while you could just add the route to the SetAppRoutes method in the TitaniumCore.RouteManager, that would require a custom core. We moved SetAppRoutes to global.asax in Ti3 for this very reason.
3.0
Just add a new ignore route to the list of ignore routes in Global.asax SetAppRoutes
ALL
Recompile the source and copy the Titanium.dll to the FTP site's bin folder.