RAR Archive (Roshal Archive). This is a compressed file format used for data storage and transfer.
Given the naming convention ( WEB18 ), the archive likely contains: WFFT22WEB18.part3.rar
You cannot open this file in isolation. You must have all preceding and succeeding parts (e.g., part1.rar , part2.rar , etc.) in the same folder. RAR Archive (Roshal Archive)