The Infinite_ammo.zip file you have requested: Modifications / Halo Trial Mods / Weapons Mods / Infinite Ammo - 5.37mb 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:
Here is an infinite ammo mod for halo trial. All the weapons have unlimited ammo, except plasma weapons.