The standard tool for .rar files is WinRAR. If you have it installed, right-click the file and select "Extract Here" or "Extract to Julklapp" .
If you don't have WinRAR, download and use 7-Zip , which is free and handles .rar files. Right-click, select 7-Zip, and choose "Extract Here". Julklapp.rar
You can use online services like CloudConvert or Extract.me if the file is small and not password-protected. The standard tool for