The file is the fourth segment of a multi-volume RAR archive . To access its contents, you must have all preceding parts (part1, part2, etc.) in the same folder. Multi-Volume Extraction Guide 02n85H0809M98984E935.part4.rar
Extracting a single part (like part4) independently is generally not possible, as the data is split across the entire set. You should follow these steps to manage and open the archive: The file is the fourth segment of a multi-volume RAR archive