.part1.rar indicates this is only the first piece of a larger multi-part archive. You cannot open it without all subsequent parts ( part2 , part3 , etc.).
If you can tell me or the general topic you are researching, I can help you find the actual PDF or official documentation you need. ls170610.part1.rar
This naming convention is frequently used on file-sharing platforms, forums, or private repositories rather than official academic journals. ls170610.part1.rar