Under OS X, a package is a directory that is normally treated by the Finder as a single file, with the components of the object that the package represents being stored in files in the directory tree under that directory.[1] Control-clicking (or right-clicking) on the package in the Finder, and selecting "Show Package Contents", allows a user to open up the bundle and see the contents.[1]
Bundles containing executable code are usually packages. In addition, some documents are also represented as packages[2]:
NOTE: The new versions of Keynote 4, Pages 3, and Numbers 2 included in iWork '09 now save a document bundle as a compressed flat file by default. To view the contents of an iWork '09 document bundle, change the extension to .zip and decompress the file.[3]
The Uniform Type Identifier (UTI) for a package is com.apple.package.[4]
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