Use a file archiver utility like to open the first part ( s0391.7z.001 ).
Without access to the specific file itself, I cannot list its exact contents. However, based on the file name format (likely a code or project number like "s0391"), it is likely one of the following: s0391.7z.005
What is the (e.g., a specific software project, an online forum, a server backup)? Use a file archiver utility like to open