: These are patch files for Ragnarok Online servers.

: Right-click the file and select "Extract to COS_RO2_DLC/" to avoid spilling files everywhere. 2. Identify the Content Type

Since .rar is a compressed archive, you will need software to open it. : Use 7-Zip (free and open source) or WinRAR .

: These are meant to be merged directly into the game's root directory. 3. Installation Steps

: Drag the extracted files into the main game folder. If prompted to "Overwrite existing files," select Yes (this is usually required for mods/DLC to work).