WinRARest un logiciel de compression de fichiers et de gestion d'archives largement utilisé. Avec son interface conviviale et ses fonctionnalités puissantes, WinRAR est devenu un choix populaire pour compresser, décompresser et gérer des fichiers.

L'un des principaux avantages de WinRAR est sa capacité à compresser des fichiers en tailles plus petites, ce qui facilite le stockage et le transfert de grandes quantités de données. Il prend en charge divers formats de compression, y compris RAR, ZIP et d'autres, permettant aux utilisateurs de travailler avec différents types d'archives sans effort.

En plus de la compression, WinRAR offre également des fonctionnalités pour créer des archives auto-extractibles, ce qui permet aux utilisateurs de partager des fichiers avec d'autres qui n'ont peut-être pas WinRAR installé. Cette fonctionnalité est particulièrement utile lors du partage de fichiers entre différents systèmes d'exploitation.

WinRAR offre une gamme d'options pour crypter les archives, garantissant la sécurité et la confidentialité des données sensibles. La protection par mot de passe et les algorithmes de cryptage ajoutent une couche de sécurité supplémentaire pour empêcher l'accès non autorisé.

De plus, WinRAR s'intègre parfaitement au système d'exploitation Windows, permettant aux utilisateurs de faire un clic droit sur des fichiers ou des dossiers pour effectuer rapidement des tâches de compression ou d'extraction. Sa fonctionnalité de glisser-déposer simplifie le processus de gestion des fichiers et des archives.

La prise en charge des archives multi-volumes de WinRAR permet aux utilisateurs de diviser de gros fichiers en plus petites parties, facilitant ainsi leur stockage ou leur transfert. Cette fonctionnalité est particulièrement bénéfique lorsqu'il s'agit de fichiers dépassant les limites de stockage ou devant être envoyés par email ou par d'autres plateformes de partage de fichiers.

WinRAR est un outil de compression de fichiers et de gestion d'archives fiable et polyvalent. Ses algorithmes de compression efficaces, ses capacités de chiffrement et son interface conviviale en font un excellent choix pour une utilisation personnelle et professionnelle. Que vous ayez besoin de comprimer des fichiers pour le stockage, de partager des fichiers en toute sécurité ou de gérer des archives efficacement, WinRAR est une solution fiable.

Caractéristiques principales :

• Compressez les fichiers pour économiser de l'espace.
• Extraire des fichiers à partir de différents formats d'archives.
• Diviser les archives en plusieurs parties.
• Chiffrer et protéger par mot de passe les archives.
• Réparer les archives endommagées.
• Gérez facilement les fichiers et les archives.
• Opérations pratiques à partir du menu contextuel.
• Fonctionnalités avancées comme les archives auto-extractibles et les volumes de récupération.

Version 5.00

1. New RAR 5.0 archiving format. You can use "RAR 5.0" option
  in archiving dialog or -ma command line switch to create
  RAR 5.0 archives.
 
  Older software including older WinRAR versions is not able to
  decompress RAR 5.0 archives, so if you plan to send an archive
  to other people, it is necessary to take the compatibility issue
  into consideration. You can select "RAR" instead of "RAR5" option
  in archiving dialog to create RAR 4.x archives compatible with
  previous WinRAR versions.

2. Changes in RAR 5.0 compression algorithm:

  a) maximum compression dictionary size is increased up to 1 GB
     in 64 bit WinRAR. 32 bit WinRAR version can use up to 256 MB
     dictionary when creating an archive. Both 32 bit and 64 bit
     versions can unpack archives with any dictionary size,
     including 1 GB;

  b) default dictionary size for RAR 5.0 is 32 MB, typically resulting
     in higher compression ratio and lower speed than RAR 4.x 4 MB.
     You can use "Dictionary size" archiving dialog option or -md
     switch to change this value;

  c) -md switch syntax is modified to support larger dictionary
     sizes. Append 'k', 'm' and 'g' modifiers to specify the size
     in kilo-, mega- and gigabytes, like -md64m for 64 MB dictionary.
     If modifiers are not present, megabytes are assumed,
     so -md64m is equal to -md64;

  d) RAR 5.0 format includes Intel IA-32 executable and delta
     compression algorithms, but RAR 4.x text, audio, true color
     and Itanium algorithms are not supported. These excluded algorithms
     are not efficient for modern data types and hardware configurations;

  e) RAR 5.0 decompression can utilize several CPU cores.
     Though not to same extent as in compression algorithm,
     it improves the decompression speed on large files
     with poorly compressible data or when using BLAKE2 checksums.

3. Changes in RAR 5.0 archive format:

  a) file times are stored as Coordinated Universal Time (UTC)
     instead of former local time, making file exchange among
     several time zones more straightforward;

  b) file names and archive comments use UTF-8 encoding.

4. RAR 5.0 recovery record is based on Reed-Solomon error correction
  codes. If recovery record size is large enough, 5% and more,
  the new error correction scheme provides much higher resistance to
  multiple damages comparing to RAR 4.x recovery record.
  Smaller record, such as 1 - 2%, or less random damage type would
  result in less difference between 4.x and 5.0. For single continuous
  damage 4.x and 5.0 efficiency is about the same.

  Additionally to usual data erasures, the new recovery record
  is able to detect deletions and insertions of much larger size
  than in previous RAR versions. Maximum insertion size is several
  megabytes. Maximum deletion size depends on the damage type
  and in some cases can be as large as the recovery record size.
 
  Still, the best recovery performance and efficiency is achieved
  if no deletions and insertions are present, so all data including
  damaged sectors preserve their original positions. Thus, if you use
  some special software to copy an archive from damaged media,
  it is better to choose the mode, when damaged sectors are filled by
  zeroes or any other data instead of cutting them out completely
  from resulting file.

  RAR 5.0 recovery record is more resistant to damage of recovery record
  itself and can utilize a partially corrupt recovery record data.
  Note, though, that "Repair" command does not fix broken blocks
  in recovery record. Only file data are corrected. After successful
  archive repair, you may need to create a new recovery record
  for saved files.

  New recovery record is not based on 512 byte sectors anymore
  and incorporates more complicated data structures. So it is impossible
  to specify its size in sectors. For RAR 5.0 archives the parameter of
  -rr[N] switch and rr[N] command is always treated as a percent of
  archive size regardless of presence of % character. Typically N%
  recovery record can repair up to N% of continuously damaged data
  and increases the archive size by only slightly more than N%.
  Ability to fix multiple damages is proportional to N.

  We used "Screaming Fast Galois Field Arithmetic Using Intel
  SIMD Instructions" paper by James S. Plank, Kevin M. Greenan
  and Ethan L. Miller to improve Reed-Solomon coding performance.
  Also we are grateful to Artem Drobanov and Bulat Ziganshin
  for samples and ideas allowed to make Reed-Solomon coding
  more efficient.

5. "Test" command verifies validity of RAR 5.0 recovery record.
  Recovery record is tested after processing all archived files.

  If corrupt archive contains the recovery record, it might be possible
  to repair it even if recovery record validity test is failed.
  "Repair" command attempts to utilize even a partially damaged
  recovery record. So treat the negative recovery record test result
  as a reason to re-create the archive if original files are still
  available, but not as a reason to avoid "Repair" command.

6. Changes in RAR 5.0 encryption algorithm:

  a) encryption algorithm is changed from AES-128 to AES-256 in CBC mode.
     Key derivation function is based on PBKDF2 using HMAC-SHA256;

  b) special password verification value allows to detect most of
     wrong passwords without necessity to unpack the entire file;

  c) if archive headers are not encrypted ("Encrypt file names" option
     is off), file checksums for encrypted RAR 5.0 files are modified
     using a special password dependent algorithm, to make impossible
     guessing file contents based on checksums. Do not expect such
     encrypted file checksums to match usual CRC32 and BLAKE2 values.

7. RAR 5.0 archives allow to utilize 256 bit length BLAKE2sp hash
  ( https://blake2.net ) instead of 32 bit CRC32 as a file checksum.
  Enable "Use BLAKE2 file checksum" option in "Options" page of
  archiving dialog or specify -htb command line switch to use BLAKE2
  checksums.

  While producing slightly larger archives, BLAKE2 can be used
  for file contents identification. If two files have the same
  BLAKE2 value, it practically guarantees that file contents
  is the same. BLAKE2 error detection property is also stronger
  than in much shorter CRC32.

8. Features removed:

  a) authenticity verification feature did not provide the required
     level of reliability and was removed;
 
  b) switch -en (do not add "end of archive" block) is not supported
     by RAR 5.0 archives, which always have the end of archive block.
     This block helps WinRAR to safely skip external data like
     digital signatures appended to archive;

  c) old style extension based arcname.rNN volume names are not
     supported by RAR 5.0 archives, which use only arcname.partN.rar
     volume names;
 
  d) file comments are not supported anymore both in RAR 4.x
     and RAR 5.0 archives. Console RAR 'cf' command is removed.
     It does not affect the archive comment support, which is present
     in both versions of archive format and is not planned for removal.

9. "Set password" command and "Dictionary size" option are moved to
  "General" page of archiving dialog.

10. You can use "Save symbolic links as links" option on "Advanced" page
  of archiving dialog to save and restore NTFS symbolic links
  and reparse points as links, so their contents is not archived.
  Command line equivalent of this option is -ol switch.

  Similar option for NTFS hard links is "Save hard links as links".
  Its command line equivalent is -oh switch.

  Both options are available only for RAR 5.0 archive format.

11. Added extraction only support for XZ archive format.

12. Changes in recovery volume processing in RAR 5.0 archive format:

  a) maximum number of RAR+REV volumes in RAR 5.0 format is 65535
     instead of 255;

  b) recovery volume operations are faster than in RAR 4.x;

  c) additionally to recovery data, RAR 5.0 REV files also store
     service information such as checksums of protected RAR files.
     So they are slightly larger than RAR volumes which they protect.
     If you plan to copy individual RAR and REV files to some removable
     media, you need to take it into account and specify RAR volume
     size by a few kilobytes smaller than media size.

13. Maximum path length for files in RAR and ZIP archives is increased
  up to 2048 characters.

14. Command line RAR returns the exit code 11 if it can detect that
  user entered a wrong password. This code can be returned only
  for RAR 5.0 archives. It is impossible to distinguish a wrong
  password and data damage for RAR 4.x archives.

15. 'v' and 'l' commands display archived file names in the end of line,
  not in that beginning as before. Also some fields previously
  available in 'l' and 'v' output are now shown only by 'lt' and 'vt'.
 
  'vt' and 'lt' commands provide the detailed multiline information
  for every archived file.

  'vta' and 'lta' also include service headers into list.

16. Now the default charset for filelists in commands like
   'rar a arcname @filelist' is ANSI for both WinRAR and console RAR.
   In previous versions it was ANSI for WinRAR and OEM for console RAR.
   You can use -scl switch to override this default.

17. Internal WinRAR viewer can detect and display files in UTF-8
   and UTF-16 little endian encodings.

18. UTF-16 little endian encoding is used in RAR and WinRAR log file
   rar.log, so Unicode file names are stored in the log correctly.
   WinRAR automatically truncates the old rar.log file in non-Unicode
   format to avoid mixing different encoding in the same log file.
   In case of console RAR you need to delete the old rar.log manually,
   otherwide RAR will append UTF-16 messages to existing rar.log.

   You can use -scg switch to change the default log file
   encoding, such as -scag for ANSI encoding.

19. Command line 'r' (repair) command can include an optional destpath\
   parameter defining the destination folder for repaired archive:

   rar r archive.rar destpath\