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thetwincats.com -7z Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs. 2019-02-21
Sourceforge.net. 7-Zip is a file archiver with a high compression ratio. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. 7-Zip works for Windows 7, Vista, XP, 2008, 2003, 2000, NT, ME, and 98.
Wikipedia. 7z is a compressed archive file format that supports several different data compression, encryption and pre-processing algorithms. The 7z format initially appeared as implemented by the 7-Zip archiver.
What is a 7z file (and how do i open one)?. What Is a 7Z file? 7Z is the file extension used for an archived file created using 7-Zip, a free, open-source file compression tool. 7Z is similar to other archived formats, such as ZIP, RAR, and ISO, but uses a higher compression ratio, along with AES-256 encryption.