Many archives come with a .sfv or .md5 file to verify that none of the parts (including part 5) were corrupted during download.
A large-scale preservation project for historical gaming content, patches, and media from the German gaming portal 4Players . 4PPs.part5.rar
Could you clarify the where you found this file or the size of the total archive? This will help me identify the exact content inside! Many archives come with a