Winrar

Starting with version 5, a new archive format, RAR5, is supported, incompatible with the previous one, but also using file extension .RAR.[5] With the introduction of RAR5, the older format is referred to as RAR4. Newer WinRAR versions can still open and create RAR4 archives, but older versions do not support RAR5 archives. Both the numerous features (authenticity verification, old style extension based arcname.rNN volume names, file comments) are removed from RAR5, and by default RAR5 is slower[citation needed] than RAR4 (default dictionary size for WinRAR v5.x is 32 MB, typically resulting in higher compression ratio and lower speed than WinRAR v4.x with 4 MB). The software is distributed as a shareware and anyone may use it during a test period of 40 days at no charge.[6] While archiving with the RAR format is proprietary,
Rarlabs supply as copyrighted freeware the source code of the UnRAR unpacker, with a license allowing it to be used in any software, thus enabling others to produce software capable of unpacking, but not creating, RAR archives.[7]

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