: Always run the file through your antivirus software or upload it to VirusTotal before running any .exe or installer found inside.
Split RAR archives are heavily used on file-sharing forums, torrents, and third-party download sites. Because you cannot see what is inside without extracting it, these files are frequently used to hide . RF.part1.rar
Are you getting a specific when you try to open it? : Always run the file through your antivirus