I can give you a more specific article or instructions on how to handle it.
Right-click only the first file ( SDF part 1.rar or SDF.part1.rar ) and choose "Extract Here." The software will automatically pull data from all parts to reconstruct the original file. If you can tell me: Where you found or downloaded this file? SDF part 3.rar
Based on the file extension and naming convention, this likely refers to a —part of a larger file (likely a game, software package, or dataset) that has been compressed into multiple parts (part 1, part 2, part 3, etc.) to make downloading easier. What is "SDF part 3.rar"? I can give you a more specific article