Because this is labeled .part3.rar , you cannot open it in isolation. You must have all preceding and subsequent parts (e.g., .part1.rar , .part2.rar , etc.) in the same folder to successfully extract the contents.
This file name follows a common pattern used by online gaming communities and archival groups for sharing split-part compressed archives. sc23263-FNAFHWv121.part3.rar
You will need an extraction utility like WinRAR or 7-Zip to process these files. Open part1.rar first, and the software will automatically chain the remaining parts together. Usage Notes Because this is labeled