Apple started shipping the Xcode betas in a new archive file format, and more than a few people on the internet freaked out. Fortunately, this great guy named Nathan came to the rescue 🙃.

Essentially, an .xip file is just a .zip with a signature to verify that the file has not changed since its creator saved it. This protects from both damage from a disk error and from a third-party tampering with the file.