The astro.challenge.gbx file you have requested: Maps Levels Missions / Tracks / Island / A to D Titles / AstrO - 14.53kb is not available. Perhaps try browsing all files for the game TrackMania: Sunrise and upload any files you want to share or are missing. This is the only information we could locate:
A simple island track by sunrise. A few jumps and a tricky one _see the intro and run the track then you will understand. Some tunnels, roads and no major difficulties except maybe the fact to keep the good line in many parts.