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Because (now Hitman World of Assassination ) stores player progression and unlocks on official IO Interactive servers, client-side mods cannot permanently "unlock" weapons for use in the standard online mode. To access all weapons and items at once, you must use a server replacement or specific offline mods.
: A specific mod for the Freelancer mode that changes how items are kept or lost upon death. Infinite Ammo / Realistic Gunfights : These gameplay-altering mods can be found on the HITMAN 3 Featured Mods List hitman 3 unlock all weapons mod