In competitive gaming (like FPS titles), these packs are often shared to help users maximize frame rates (FPS) by lowering demanding graphical settings or optimizing engine parameters.
Use a utility like 7-Zip or WinRAR to right-click the file and select "Extract Here". Configs Pack.rar
Since .rar is a compressed format, you must extract the files before they can be used: In competitive gaming (like FPS titles), these packs