Stepu.7z
daemondevin/7-ZipPortable: A portable build of 7-Zip ... - GitHub
Uses the LZMA and LZMA2 algorithms to significantly reduce file sizes. Stepu.7z
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. daemondevin/7-ZipPortable: A portable build of 7-Zip
Supports AES-256 encryption to protect your data with a password. Supports AES-256 encryption to protect your data with
Can be converted into an .exe file that extracts itself without needing the 7-Zip software installed.
Combines multiple similar files into a single stream to achieve even better compression.
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