Since .rar is a compressed format, you must extract the files before they can be used:
It is a best practice to back up your original settings before overwriting them with a new config pack. Security Warning Working with Configuration Packages (a.k.a. Rapid Start) Configs Pack.rar
Players often seek packs that replicate the exact mouse sensitivity, keybinds, and crosshair settings used by professional players. Since .rar is a compressed format
Most packs require you to move the extracted files into a specific directory, such as a game's \cfg\ or \mods\ folder. Configs Pack.rar
Use a utility like 7-Zip or WinRAR to right-click the file and select "Extract Here".