: This is a WinRAR compressed archive used to package the game files.

Universe Sandbox is a simulator that allows users to manipulate the cosmos using real-life science. I really think US2 should have a manual - Universe Sandbox

Files from unofficial sources often contain that can compromise your system.

: This specific file naming convention is frequently used on third-party file-sharing or "repack" sites. Official versions of Universe Sandbox are not distributed as standalone .rar files ; they are managed through the Steam Store or the official Universe Sandbox website .