An .XIP file is analogous to a .ZIP file which can be digitally signed for integrity. The .XIP file format was introduced in OS X 10.9, along with Apple's release of Swift. .XIP allows for a digital signature to be applied and verified on the receiving system before the archive is expanded. When a XIP file is opened (by double-clicking), Archive Utility will automatically expand it (but only if the digital signature is intact).
Apple has reserved the right to use the .XIP file format exclusively, removing it from public use since release. Starting with macOS Sierra, only .XIP archives signed by Apple will be expanded. Developers who had been using .XIP archives were required to move to using signed installer packages or disk images. 
- "xip(1) Mac OS X Manual Page". developer.apple.com. Retrieved 2017-04-11.
- "What's New in Xcode". Apple Developer. Apple. Archived from the original on 26 January 2017. Retrieved 20 August 2016.
- "Technical Note TN2206: macOS Code Signing In Depth". developer.apple.com. Retrieved 2019-08-29.
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