The desertplat.zip file you have requested: Maps Levels Missions / Single Player / Desertplat - 26.6mb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
This is an actual sp map to load put in your halo ce folder and when you get to the ui bring up console and type (without quotes) "map_name desertplat" then it will load WARNING If you try and load this as a mp map the game will crash you have to Halo Ce single player map. Won't work in multiplayer.