FILEUNZIP, FILEUNZIPAS and FILEUNZIPLIST now support RAR files. There is
no RAR compress option, only uncompress. Extraction is not multi-threaded,
and does not support extracting hard or soft links.
For now, the UNRAR features do not support AG specific file features such
as MEM: or HTTP: files because the UNRAR code makes direct calls to windows
for file access.
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