: Most commonly uses the LZMA or LZMA2 algorithms, which provide a significantly higher compression ratio than standard ZIP files.
To "look at" or report on the specific contents of mna.7z , you must use an archive manager: :
Alternatively, WinZip and Trend Micro's Unzip One both support the 7z format. :
ZArchiver is a common choice for mobile users to extract and view 7z archives. 7z - man pages section 1: User Commands
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