You will need a program capable of opening RAR files. Common options include: WinRAR: (Windows) The original tool for RAR files. 7-Zip : (Windows) A free, open-source alternative. The Unarchiver : (macOS) Extract the Files: Right-click only on the sc25332-TDFC.part1.rar file.
Ensure that you have downloaded all parts of the archive (part1, part2, etc.) to the same directory on your computer. sc25332-TDFC.part1.rar
This means you are missing a part of the set (e.g., you are missing .part2.rar ). Download all required parts. You will need a program capable of opening RAR files