Before attempting to extract, run the file through a reputable scanner like VirusTotal to check for malicious signatures.
Use an updated tool like WinRAR or 7-Zip to right-click the first part and select "Extract Here." pTOK4IWRZFB1.part1.rar
If this is a legitimate file you need, ensure you have all subsequent parts (part2, part3, etc.) in the same folder. Before attempting to extract, run the file through
Do you remember this file from, or are you trying to verify the contents of a specific download? Before attempting to extract