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I have a sitx archive. I think this is some MAC thing, but I need to open it in Windows.

7Zip doesn't recognize it.

What should I use?

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Look out for that ATM! – Nerdling Jul 30 '10 at 17:29
What ATM are you talking about? – Brian Webster Jul 31 '10 at 16:56
I wish there was a better answer to this. Aladdin haven't updated StuffIt deluxe since 2010 and Stuffit Expander for Windows hasn't been updated for 5 years. I can't get it to work under Windows 10. It's a real shame. – seagull Feb 3 at 23:13
up vote 5 down vote accepted

It was created by Stuffit, there is a free expander program to extract it.

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