Files bearing the .7z file extension are compressed and archived files in the same vein as .zip, .gzip, or .rar. The format, originally developed by Igor Pavlov for his 7-zip archiving tool, uses LZMA (Lempel-Ziv-Markov chain-Algorithm) compression by default, but also supports BCJ, BCJ2, BZip2, Deflate, and PPMD compression. One of the biggest advantages of the .7z format is the ability for any compression, conversion, or encryption to be stacked, due to the file structure's container system. This stacking allows for a greater compression rate with a reduced risk of data loss. Some of the other advantages are the high compression rate itself, the ability to add security, the open architecture of the format, and the architecture allowing for additional compression methods to be added later.
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