It's a Chinese free archvier which is very much like pay WinRAR. It can do everything you need..
Files compression is largely dependent on what type of files are need to be compressed. For example, video and photographs are badly compressing with the archivers, but they can be well compressed with a special editors and converters.
And if you want to compress some documents or to pack all the compressed files into one archive, of course it's best to do it with a special compressor - archiver, which can be downloaded from this page.
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Related Link: Achiver 7-Zip