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Talk to the man in red.
Ask him it it’s his safe on the shelf and then ask him for the KEY. He’ll give it to you. Use the key on the safe and discover another KEY inside. Walk through the door (stand against it and walk slightly to the left) to find a chest in the next room. Use the key on the chest and your quest is over.
Game source: A copy of the game was found here  on the internet.