While appears to be a specific compressed archive file rather than a widely documented brand or public standard, its naming convention strongly suggests it is a collection of resources related to the popular Japanese role-playing game Granblue Fantasy (GBF) . The "JL" prefix often refers to specific modders, Japanese-language assets, or "Jump-Link" utility packs within gaming communities. Understanding the RAR Format
Based on the community's typical use of such archives, this file likely contains one of the following: JL-GBF.rar
Because .rar files can execute scripts once unpacked, always observe these precautions: Installing Mods - Granblue Fantasy - Relink Modding While appears to be a specific compressed archive