RAR archiver: * RAR introduces an original compression algorithm.  It allows higher   compression ratios than other PC archiving tools, especially   on executable files, object libraries, large text files, etc. * RAR offers an optional compression algorithm highly optimized   for multimedia data. * RAR provides functionality for creating a 'solid' archive, which   can raise the compression ratio by 10% - 50% over more common   methods, particularly when packing large numbers of small files. * RAR offers the ability to create and change SFX archives using   default and external SFX modules. * RAR offers the ability to create a multi-volume archive as SFX. * RAR offers a number of service functions, such as setting a   password, adding archive and file comments.  Even physically   damaged archives may be repaired and an archive may be locked   to prevent further changes.  Authenticity information may be   added for additional security and RAR will store information   on the last update and name of the archive.