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WinRAR flaw lets hackers run programs when you open RAR archives
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
No, the fact that businesses pay for it for something of that guarantee despite there being free peer-alternatives means that it is a better guarantee.
When you see businesses electing to pay for something despite free alternatives, there is likely a reason (or a number of them). I've seen free tools go from active maintaining to completely dead in a single update due to the work needed to get it back up and operating with new environment-side changes.
And we've all seen companies go out of business overnight. There's no more guarantee that WinRAR will still be around tomorrow than there is for 7z.