world.zip is a beta file of the Minecraft map Age Of Gunpowder, made for Minecraft 1.12.2. It was published on October 23, 2021 and is 1.7 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Age Of Gunpowder map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.