A .rar file is a compressed file format, similar to a .zip file. You will need special software to open it.
Knowing this will help me confirm the safest official source.
If the extracted content contains a setup.exe or install.cmd , right-click it and choose to ensure proper installation.
The safest way to download this is from the official manufacturer's website (e.g., Lenovo, Dell, HP, Microsoft, or a device driver site) [1, 2].
is this 7131 X64 file for? Where did you first see this file mentioned?
Select > Extract Here (or "Extract to..." to choose a folder).