: It uses the LZMA/LZMA2 algorithms , which typically produce smaller file sizes than standard .zip files.

Since .7z is not natively supported by all operating systems, you may need a third-party tool. How to open a .7z file - Microsoft Q&A

The file is a compressed archive created using the 7-Zip utility. The .7z extension signifies a format known for high compression ratios and AES-256 encryption capabilities. Understanding the .7z Format

: It can bundle multiple files and folders into a single, smaller package for easier sharing. Security : The format supports strong password protection. How to Open and Extract BWMi1.7z