Since .rar is a proprietary compression format, you will need a specific utility to open it.

Use WinRAR (the native format creator) or 7-Zip (a free, open-source alternative).

If prompted for a password, check the website where you found the link. Common default passwords for such archives are 123 , 1234 , or the URL of the website itself.

Before interacting with the contents, verify that the file is safe.

Right-click the game in your library > Manage > Browse local files . This is usually where the files need to be placed.

Upload the .rar file to VirusTotal to check it against dozens of antivirus engines.