: Use software like WinRAR or 7-Zip to open "part1.rar"; the software will automatically combine the subsequent parts to show you the full list of files.
If you have all the necessary parts, you can use extraction tools to view the contents:
The specific file is likely part of a split RAR archive, where a larger set of data has been broken into smaller pieces for easier sharing or storage. While the exact contents depend on the source of the file, the naming convention provides several clues about its identity: Breakdown of the Filename