Uses the LZMA and LZMA2 algorithms to significantly reduce file sizes.
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
Can split large files into smaller volumes (e.g., .7z.001 , .7z.002 ) for easier sharing. How to Open or Create "Stepu.7z" Uses the LZMA and LZMA2 algorithms to significantly
daemondevin/7-ZipPortable: A portable build of 7-Zip ... - GitHub Stepu.7z