Ensure you have the complete set. If the archive is 5GB and you only have the 1GB part1, extraction will fail.
Always run an antivirus scan on the folder once extraction is complete. Tools like VirusTotal allow you to upload suspicious files for a multi-engine security check.
Below is a blog post explaining what this file is, how to handle it, and the security risks associated with it. Navigating Multi-Part Archives: What is Land101.part1.rar?
Files found in split archives, especially from unverified third-party sources, carry a high risk of containing malware or unwanted "bloatware."