To "put together a piece" (i.e., extract, install, or use this file), here is the standard procedure:
Read any included text files (e.g., readme.txt or instructions.txt ) for specific installation steps, as mods vary in how they are applied.
To help you with the specific files inside that .rar archive, I'd need to know:
Always back up your original game files before overwriting them to prevent game corruption.
Based on typical naming conventions, this archive likely contains for the game.