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 . To access its contents, you must have all preceding parts (part1, part2, etc.) in the same folder. Multi-Volume Extraction Guide