: 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: : mna.7z
ZArchiver is a common choice for mobile users to extract and view 7z archives. 7z - man pages section 1: User Commands : Most commonly uses the LZMA or LZMA2