WinRAR – What’s new in the latest version
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