Switch -CL - convert file names to lower case
When this switch is used, names of all files extracted from an archive, added to an archive, modified or update within an archive, will be converted to lower case. This is sometimes useful when moving an archive from a case insensitive OS to a case sensitive OS, for example extracting under UNIX, an archive created under DOS.
extract all files from port.rar converting names to lower case
WinRAR x -cl port