: It uses the LZMA and LZMA2 algorithms, which often result in file sizes 30–70% smaller than standard ZIP files.
Are you trying to from this file, or did you receive it as part of a larger download package ? nkaj2.7z
: It can theoretically store archives up to 16 billion gigabytes. How to Open It : It uses the LZMA and LZMA2 algorithms,