Rar files are compressed archives. The term "Archive" in this context means that the file may contain one or more files, or even folders, much like folders on your hard disk. "Compressed" means that mathematical techniques have been used to reduce the space needed to store the files, so that the size of the archive may be much smaller than the size of the files it contains.
You open rar file by using winrar.
WinRAR is an archive manager that specifically supports Rar archives, in addition to other formats such as Zip and Cab archives. It has a colourful user interface and a wizard that makes it easy to use for beginners.
WinRAR provides complete support for the Rar archive format. It can create Rar files as well as open them, it can repair corrupt Rar archives, verify the authenticity of Rar archives and create self-extracting Rar archives that can be opened by other Windows users who don't own a copy of WinRAR.
WinRAR runs on all versions of Windows. There are also command line versions for other platforms including MS-Dos, Linux, Mac OS X and OS/2.
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5:42 PM on July 11, 2008