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The format, developed by Igor Pavlov and released in 1999, is an open-architecture archive format renowned for achieving some of the highest compression ratios in the industry. It primarily utilizes the LZMA (Lempel-Ziv-Markov chain algorithm) and its successor LZMA2 , which offer significant size reductions over the standard ZIP format. Core Technical Architecture

The development of the .7z format is characterized by its , allowing it to support virtually any new compression, conversion, or encryption method as they are developed. Does 7z compress better than zip? - Microsoft Community Hub Best 7z