Check for "Part 1," "Part 3," etc., as most large games require all RAR parts to be in the same folder before extracting.
Information on current or free-to-play options like Warzone. download-call-duty-moden-warfare-apun-kagames-biz-part2-rar
Right-click on Part 1 only and select "Extract Here." The software will automatically pull data from part2.rar and others to reconstruct the full installer. Check for "Part 1," "Part 3," etc