7-Zip has a 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, MSI, WIM, Z, CPIO, RPM, DEB and NSIS. For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 better than ratio provided by PKZip and WinZip. Self-extracting capability for 7z format. Integration with Windows Shell. File Manager, and command line version.