We recommend you download it and install it so you can decompress some files. The software is Open Source and FREE to use :).
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The main features of 7-Zip
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* High compression ratio in new 7z format with LZMA compression.
* Supported formats: Packing/unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS.
* For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip.
* Self-extracting capability for 7z format.
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