: Reducing the size of large media or database files by up to 30–40% compared to standard ZIP formats.

Files like AB4.rar are primarily used to bundle multiple directories and individual files into a single, smaller unit. This is particularly useful for:

: Bundling complex application components (often labeled with versioning like "AB4") to ensure users receive all necessary dependencies in one package.

: Providing the ability to encrypt file-tree structures and require passwords for extraction, protecting sensitive intellectual property.