WinRAR and the RAR file format have evolved over time.
Support for the archive format RAR5, using the same RAR file extension as
earlier versions, was added in version 5.0;[7] files in the older RAR file
format have since been referred to as RAR4. WinRAR versions before 5.0 do not
support RAR5 archives;[8] only older versions of WinRAR run on Windows versions
prior to XP, and cannot open RAR5 archives.
The RAR5 file format increased the maximum dictionary size
to 1 GiB; 11 different compression directory sizes from 1 MiB to 1 GiB are
available, with the default in version 5 increased from 4 MiB to 32 MiB,
typically improving compression ratio. AES encryption, when used, was increased
from 128- to 256-bit. Maximum path length for files in RAR and ZIP archives is
increased to 2048 characters.[8]
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