.rar is a proprietary compression format created by WinRAR. It is known for high compression ratios and the ability to "span" volumes across multiple files. How to Open It
You must always initiate the extraction by right-clicking on file23.part1.rar . Use the Right Tools: file23.part2.rar
WinRAR (the original) or 7-Zip (free and open-source). macOS: The Unarchiver or Keka . Linux: unrar via the command line. file23.part2.rar
Sometimes a specific part (like part 2) gets corrupted during download. Most download managers can re-verify the file, or you may need to download that specific part again. file23.part2.rar