The long.challenge.gbx file you have requested: Maps Levels Missions / Tracks / Complex / Long Track (1.1.1) - 31.91kb is not available. Perhaps try browsing all files for the game TrackMania Nations Forever and upload any files you want to share or are missing. This is the only information we could locate:
For more information on TrackMania Nations, visit Trackmania.filefront.com This is a very long track. the first time I completed it it took me around 17:00min. The best time is some were around 13:00min.