This indicates a "split archive." In the world of digital distribution, large games are often broken into smaller segments (Part 1, Part 2, etc.) to make downloading more manageable and to avoid data corruption. You need all parts in the set to successfully extract the game.
The "Razor1911" tag in the filename indicates this was a release from one of the oldest and most prestigious software cracking groups in history. Founded in 1985, Razor1911 is known for its high-quality releases, custom installers, and iconic "chiptune" music that often plays during the installation process. Understanding the File Format Overcooked_2_The_Moon_Harvest-Razor1911.part1.rar
The naming structure follows a strict protocol used by underground groups to ensure releases are easily searchable and categorized across various servers (often called "topsites"). Why This is "Interesting" This indicates a "split archive