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ShowPackageContents

An application package under Mac OS X -- note the contextual menu command

A package is a folder that has been flagged specially so that the Finder presents it to the user as a single document. This discourages users from messing with the implementation details accidentally, while making it easy to do so if the need arises.

Packages are a conceptual replacement for the resource fork (see ResEdit), with many advantages:

  • Resources (strings, images, code, etc) are now stored as discrete files instead of byte ranges within a single file (the document's resource fork). This reduces the need for special resource editors and APIs to access the resource fork -- no more need for ResEdit.
  • Developers (and users) can manipulate the contents of a package in the Finder by invoking the "Show package contents" contextual menu (right click) command.

All Mac OS X applications (and many documents) are packages.

In Mac OS 9 there was a utility called Package First Aid that re-flagged package folders as such.

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