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Use a UUID lookup tool, like http://minecraft-techworld.com/uuid-lookup-tool to determine the UUID of the player.Use a UUID lookup tool, like http://minecraft-techworld.com/uuid-lookup-tool to determine the UUID of the player. This tool works for registered online players.Offline Mode: Offline UUID and usernames are stored in* minecraft/usercache.jsonEach players profile is stored as a file named by the UUID with the .dat extension located in* minecraft/world/playerdataReplace "world" with the name of your world. The playerdata files DO NOT contain the username. If you are trying to determine which offline server player the file belongs to, knowing only the UUID, you will need to reference usercache.jsonYou can delete usercache.json without consequences to your world.If an op player gets a custom head another user created, even though the owner of the head has never joined your world an entry will be created in the usercache.json file.Usernames of a different case, such as Nicole and nicole will generate different UUID player files. Usernames are case sensitive.