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+1 for MacPAR Deluxe. Great little app to handle RARs and PAR2s. It's just been updated to allow setting a different location for expanding RAR archives. Great for those huge MKVs :rolleyes:
 
Opening RAR files should be easy, which is why I use UnRarX. It opens when I double-click a RAR file, opens it and then closes, couldn't be easier.
 
BetterZip

I like BetterZip. That said, it's a full-featured archiver/unarchiver that supports multiple formats and costs $20. If all you want to do is extract RAR files, then I would agree with the many here that suggest UnRarX.
 
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