File: Cos_ro2_dlc.rar ... -

: Copy your game’s original folder before moving any new files.

: Find where your game is installed (e.g., C:\Games\RO2\ ). File: COS_RO2_DLC.rar ...

: These are patch files for Ragnarok Online servers. : Copy your game’s original folder before moving

: These suggest console DLC (common for PS3/RPCS3 emulation). You typically install these via a Package Manager . File: COS_RO2_DLC.rar ...