OS X Application Bundles
Application bundles are directory hierarchies, with the top-level directory having a name that ends with a .app extension. In an application bundle, the first directory in the bundle underneath the top-level directory is usually named Contents. Within Contents there is usually another directory (called MacOS on Macs, or using the application's name on GNUstep), which contains the application's executable code. Within the Contents folder there is usually also a directory called Resources, which contains the resources of the application.
Among other things, the Resources folder contains localized versions of the application's nib files.
Other common subdirectories include Plugins, Frameworks, and Shared Frameworks. The Frameworks directory contains frameworks used by the application, and are used even if another version of the framework exists on the system. The Shared Frameworks directory contains frameworks that can be used both by the application that contains them, and other applications; they are used only if a newer version does not exist elsewhere on the system. Plugins contains extensible code used by the application.
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