This is a compressed file format. You cannot run the game using only "Part 2"; you need all the parts in the set to successfully extract the game. How to use it
Large games are often broken into smaller chunks (Part 1, Part 2, etc.) to make downloading more manageable and to stay within file size limits of hosting services. The.Riftbreaker.Build.9969706.part2.rar
If your extraction software says "CRC failed" or "Part 2 is corrupt," you may need to re-download that specific file. This is a compressed file format