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7z is a file format for archiving and data compression, developed by Igor Pavlov. It is the native format of the 7-Zip archiving application.
The 7z format defines many compression methods. The ones normally used are LZMA2 (default for 7-Zip 9.30 alpha +), LZMA (default for 7-Zip prior to 9.30 alpha), PPMd, and bzip2.
7z files begin with signature bytes
'7' 'z' BC AF 27 1C.
- Refer to the DOC/7zFormat.txt and DOC/Methods.txt files in the source distribution.