Ensure all files are in the same folder and have sequential extensions ( ...001 , ...002 , ...003 ).
For more information, you can find discussions on 7-Zip features in this ENCODE.SU Forum thread. SS-Jul-039_s.7z.002
To effectively work with this file, here is a useful guide for handling split archives: Ensure all files are in the same folder
Right-click the first file ( .001 ) and select 7-Zip > Extract Here or Extract to... . The software will automatically merge the files and extract the contents [7-Zip Documentation]. ...003 ). For more information