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In file UrlRewriter.cs line: 240 you have bug:
check requestPath.Contains(virtualFolderName), but if you have path like 'Generator.aspx' and virtualFolderName = 'en' the condition return true but isn't true. My suggest is use: (requestPath.Contains(virtualFolderName + "/")
I've changed it according to your suggestion and pushed it to the source code repository.