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?
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"? SDF part 3.rar
Use software like WinRAR (Windows), 7-Zip (Windows), or The Unarchiver (macOS). Right-click only the first file ( SDF part 1