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 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.

It Can Be This Complex
The entire hierarchy of the Firefox browser app ( is drawn out all the way just to show how elaborate the contents of a package can be.
References in periodicals archive ?
me enterprise accounts, is available via a free app extension in the Chrome Web Store.
SkyNote is an app extension of one of Maxthon 3's most popular features -- a free, cloud-based note feature that comes with every version of Maxthon's high performance desktop web browser: Maxthon 3.