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Starting with Xcode 8 beta, all available download binaries are packaged in a format called .xip.
It is a measure that Apple has taken to prevent the following event from happening again.
https://9to5mac.com/2015/09/20/xcode-ghost-app-store-malware-malicious-apps/
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What is .xip format?
A XIP file is analogous to zip file, but allows for a digital signature to be embedded and be verified on the receiving system, before the archive is expanded.
Verifying that a Package is Signed
When Apple’s Gatekeeper feature is set to only allow applications downloaded from the Mac App Store and identified developers, users can only install signed packages.
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To verify that a package is signed, execute the following command on a computer with the package:
pkgutil –check-signature /path/to/package.pkg
If the output is “Status: signed by a certificate trusted by Mac OS X”, the package is signed. If the output is “Status: no signature”, the package is not signed.
However, the easiest way to expand the .xip file is to use Archive Utility.
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Right-Click and open with Archive Utility from Finder.
After a while, the XCode.app will be extracted, copy the app into Application as usual.
When starting the Xcode app the first time, you will see the App being verified by macOS Gatekeeper process.
Basically since the app is downloaded it from a internet, Gatekeeper examines the entire bundle, making sure that there is no suspicious code. This may take a while, likely 10-20 minutes.
If you don’t want to wait forever, this command might help by removing the