APP file

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APP file

An application in the Mac. Although files with an APP extension appear to be single files, they are actually a hierarchy of files and folders that contain the executable program, other software components and data. Known as an application "package" or "bundle," the APP file extension is used with several other operating systems.

iOS Mobile Apps
Apple's iOS apps also use the APP package, although for ARM hardware rather than Intel. When submitting to the App Store, the Xcode development system compresses (zips) the APP package along with iTunes images and meta-data into an archive with the iPhone App (IPA) extension.

Mac Utilities
Here are some of the utility apps that come with Macs. For example, is a screen capture tool, and Migration copies files to another computer.

Inside the Grab App Package is actually a Contents folder that contains these files and folders. Right clicking an .app file and selecting Show Package Contents reveals the hierarchy.

An App Can Be This Complex
The entire hierarchy of the Firefox browser ( is expanded just to show how elaborate the contents of an app package can be.
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References in periodicals archive ?
Microsoft (MSFT) has brought its "Microsoft To-Do" application to Apple's (AAPL) App Store, which will support many of the app's key features right away, according to the Mac App Store Preview web page.
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The Mac App Store will also get a full redesign featuring
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It has told users the app will no longer be available to download in the Mac App Store and has suggested all users of Apple's computers switch to using Twitter on the web.
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Final Cut Pro 10.4 is available as a free update for existing users, and for $299.99 for new users on the Mac App Store.
Final Cut Pro 10.4 is available as a free update today for existing users, and for $299.99 for new users on the Mac App Store.
We encourage users to download software only from trusted sources like the Mac App Store, and to pay careful attention to security dialogs that MacOS presents.'