Hi. In EPiServer CMS 4.61 i used the IFastFileDownload for some purposes. When I try to do the same in EPiServer CMS 5.1 I get an InvalidCastException. Unable to cast object of type 'EPiServer.Web.Hosting.VirtualPathVersioningProvider' to type 'EPiServer.Web.Hosting.Versioning.IFastFileDownload'. Is it not possible do this in EPiServer CMS 5.1? If it is possible, how do I do it? EPiServer CMS 4.61: string path = "/demo/myfolder/mytext.txt"; UnifiedFile file = UnifiedFileSystem.GetFile(path); IFastFileDownload filedownload = (IFastFileDownload)file.Provider; EPiServer CMS 5.1: string path = "/demo/myfolder/mytext.txt"; UnifiedFile file = HostingEnvironment.VirtualPathProvider.GetFile(path) as UnifiedFile; IFastFileDownload picdownload = (IFastFileDownload) file.Provider;