You will need a dedicated extraction tool. Popular options include WinRAR , 7-Zip , or The Unarchiver for macOS.
Since this file name doesn't appear to be a widely known software or media package, please be cautious:
However, if you have found a link and are looking to handle the file, here is what you need to know about working with .rar archives: Managing .RAR Files
If your browser tries to download it as a .php file or a generic attachment , you may need to manually rename it back to .rar to open it correctly.