7-Zip is a file archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), Oracle Help Center How To Open .7z Files on Android
To "look at" or report on the specific contents of mna.7z , you must use an archive manager: : mna.7z
The macOS Finder can often unpack these natively, but third-party tools like Commander One are required to create them or view contents without full extraction. : 7-Zip is a file archiver with the highest compression ratio