Stepu.7z | FAST ◆ |

Combines multiple similar files into a single stream to achieve even better compression.

Can split large files into smaller volumes (e.g., .7z.001 , .7z.002 ) for easier sharing. How to Open or Create "Stepu.7z" Stepu.7z

Supports AES-256 encryption to protect your data with a password. Combines multiple similar files into a single stream

Can be converted into an .exe file that extracts itself without needing the 7-Zip software installed. Stepu.7z

daemondevin/7-ZipPortable: A portable build of 7-Zip ... - GitHub

If you are looking to create a "feature" (functional enhancement) for a project contained within this archive, or if you meant to ask about features for the format itself, here are the standard capabilities and ways to work with it: Common Features of 7z Archives