Use software that supports 7-Zip multi-volume archives, such as:
Creating encrypted backups that are split across multiple physical storage media [1]. 3. How to Open/Extract PG.7z.001 PG.7z.001
Ensure you have PG.7z.001 , PG.7z.002 , ..., PG.7z.00N in the same directory [1]. Use software that supports 7-Zip multi-volume archives, such