When dealing with split RAR files from third-party sources, it is important to verify their integrity:
Multi-part archives are common vectors for bundled adware or malware. It is highly recommended to run this file through a service like VirusTotal before extraction. DiRT4.part2.rar
This usually means part2 was not fully downloaded or the file size does not match the other parts in the set. When dealing with split RAR files from third-party