Recpressions.7z Site

If the archive actually contains a "recompression" utility, it is likely leveraging these 7-Zip benefits:

It allows for strong password protection of the archived data.

Since .7z is a high-compression format, you will need a compatible utility to view its contents:

The LZMA and LZMA2 algorithms used in 7z often make files 30-70% smaller than standard ZIP files.