7-Zip (64-bit) can archive and unpack files on your 64-bit OS. 7-Zip (64-bit) 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.