7-zip is very light, fast, easy to use and has a simple GUI and 64bit support. All basic features are here for the casual user. Here are the formats listed on their website:'High compression ratio in 7z format with LZMA and LZMA2 compressionSupported formats: Packing & Unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM. Unpacking Only: ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR and Z.'Also included are an AES-256 Zip & 7-zip encrypter, 7-zip self extractor, Windows shell integration, File manager, command-line version & FAR manager plugin.'So far 9.20 has been the last stable version since 2010. A stable release has not had any new features or improvements for years. A new 15.05 beta version with improvements is available, so what is happening? Why are all these betas released with no stable one? Also the 8-bit GUI is just ugly these days. Some new icons with more options for the toolbar would be appreciated. It is a really good archiver if you only need it for simple packing & unpacking archives and not much more, but if you are looking for more features you will be better off using another archiver that can do the same as 7-zip and more such as PeaZip, Bandizip or ZipGenius. If you insist on using 7-zip then you are better off using the 15.05 beta version with fixes, but a stable version would be much preferred. Review details