: Using a program like WinRAR or 7-Zip , right-click only the first file ( part1.rar ) and select "Extract Here" or "Extract to [Folder Name]" .
: If the extracted content is a .Sims3Pack , you can double-click it to open the official launcher for installation, or use the The Sims 3 Pack Extractor to bypass the launcher for better game performance. The.Sims.3.World.Adventure.part1.rar
: If the RAR contains a .world file, it should be placed in the game’s installation directory: GameData > Shared > Non-packaged > Worlds . : Using a program like WinRAR or 7-Zip