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Topic pages can also be rendered from ordinary .htm files located on your site. The files should go in the App_Templates/Skin_#/ folder, and must have .htm file extensions. Also remember that they must be complete, valid html files with opening and closing html, head, and body tags.
Topics created this way are accessed just like any other topic: /t-topicname.aspx (where topicname is the filename, without extension).