rtk-1.2.2.jar is a beta file of the Minecraft mod Create: Liquid Blueprints, made for Minecraft 1.10.2. It was published on January 16, 2017 and is 0.1 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 Create: Liquid Blueprints mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.