: The software will automatically pull data from part 2 (and subsequent parts) to reconstruct the original full file.

: Select "Extract Here" or "Extract to [Folder Name]".

: Use a tool like 7-Zip or WinRAR and right-click specifically on Part 1 .

Are you getting an when trying to extract, or are you missing some of the other parts? How to Extract Part .RAR Files (Full Guide)