The 39fmons36fter_s33ftunt36frack_60fi.challenge.gbx file you have requested: Maps Levels Missions / Tracks / Miscellaneous / 0 to 9 Titles / Monster Stuntrack I - 11.76kb 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:
ceo_tw has created a track for Trackmania Nations. It includes lots of stunts.