Stepu.7z -

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

Supports AES-256 encryption to protect your data with a password. Stepu.7z

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

Combines multiple similar files into a single stream to achieve even better compression. Stepu.7z

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

There is no widely recognized software feature or specific public project named Based on the file extension, this is likely a private compressed archive created with 7-Zip software.