Stepu.7z [FREE]

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

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. Stepu.7z

daemondevin/7-ZipPortable: A portable build of 7-Zip ... - GitHub Supports AES-256 encryption to protect your data with

Uses the LZMA and LZMA2 algorithms to significantly reduce file sizes. Stepu.7z

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