Go back to the website, forum, or torrent where you downloaded "part1" and look for the other parts (part2, part3, etc.).
You must download all associated files ( .part1.rar , .part2.rar , etc.) to the same location.
Downloading pirated games, especially from unknown sources, carries a high risk of malware infection. Ensure your antivirus software is active.
This file name suggests it is part of a compressed download for the game Crisis Core: Final Fantasy VII Reunion . Multipart archives (part1, part2, etc.) require to be in the same folder to successfully extract the contents. What to do: