13n.7z.001

: Ensure all parts have the exact same base name ( 13n.7z ) before their numeric extension; otherwise, the software will not recognize them as a single set. How to Extract .7z.001 files - Microsoft Q&A

: If the extraction fails with a "Unexpected end of data" error, you are likely missing one of the numbered volumes in the sequence. 13n.7z.001

: Select "Extract Here" or "Extract to [Folder Name]" from the context menu. Common Troubleshooting : Ensure all parts have the exact same base name ( 13n