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I downloaded a software from the internet which is in .arc format. How can I extract the files on MAC?

The arc file is 4GB, but I believe it will be 30 GB when extracted.

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There's a great, free, Mac app called The Unarchiver that has extracted every archive I've ever thrown at it. The supported formats page says it will extract ARC files as well.

The Unarchiver homepage
The Unarchiver on the Mac App Store

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Take a look at ARC File Extension for different file formats with the .arc suffix.

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