AES encryption, when used, is in CBC mode and was increased in strength from 128- to 256-bit. The RAR5 file format increased the maximum dictionary size to 1 GB 11 different compression directory sizes from 1 MB to 1 GB are available, with the default in version 5 increased from 4 MB to 32 MB, typically improving compression ratio. WinRAR versions before 5.0 do not support RAR5 archives only older versions of WinRAR run on Windows versions prior to Windows Vista, and cannot open RAR5 archives. Support for the archive format RAR5, using the same RAR file extension as earlier versions, was added in version 5.0 the older RAR file format has since been referred to as RAR4.

WinRAR and the RAR file format have evolved over time. Related programs include the command-line utilities 'RAR' and 'UNRAR' and versions for macOS, Linux, FreeBSD, Windows CE, and MS-DOS. An Android application called 'RAR for Android' is also available. WinRAR supports creating encrypted, multi-part and self-extracting archives. To enable the user to test the integrity of archives, WinRAR embeds CRC32 or BLAKE2 checksums for each file in each archive. It can create and view archives in RAR or ZIP file formats, and unpack numerous archive file formats. WinRAR is a trialware file archiver utility for Windows, developed by Eugene Roshal of win.rar GmbH.

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