Recommendations for IOS RAR unzip utility

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iOS & iPadOS

I've just set up a WDMyCloud device. I've realised a lot of the books I have on it are in RAR as well as zip formats. I don't want to convert them all to zip as there are too many. Can anyone recommend a good IOS utility that I can unzip them in and in turn send the unzipped file to Voice Dream?

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