WinRAR is a program that is used to create and decompress ZIP and RAR files. Compressed files takes up less space on your computer, and makes it easier to email files to others. WinRAR also lets you open compressed files that have been downloaded from the internet and email attachments, as well as repairing damaged files. The newest version also supports RAR5, a new compression file. You can also protect your compressed files with a password that will hide your files from others. WinRAR is supported on Windows Vista, XP, 7, and 8 as well as 32-bit and 64-bit systems.