A .rar file (like v1.rar ) is a —a single file containing multiple other files (documents, images, or game assets) packed together to save space, similar to a .zip file.
Right-click the v1.rar file and select "Extract Here" or "Extract to [Folder Name]" using the software you installed. Access: Open the new folder created to access the files.
For games like The Sims 4 or Pathologic , these usually contain .package or script files to be moved into the game's Mods folder.