The Zombie_Mega_Map_Pack.zip.003 file you have requested: Maps Levels Missions / Map Packs / Zombie Mega Map Pack 3 - 1000mb is not available. Perhaps try browsing all files for the game Call of Duty: World at War and upload any files you want to share or are missing. This is the only information we could locate:
Comes with 81 Zombie maps for Call of duty World at War. There are four files so download them all to extract.