The ui.map file you have requested: Tools and Utilities / Others / UI Map - 2.53mb 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:
A custom uimap file that allows u to create u own custom gametypes for halo trial.Note: You must have XETAV to run your custom gametypes. I did not create this BUT I do take credit for uploading this to Filefront. A custom map file for halo trial that allows you to create your own custom gametypes.