APP file
An application in the Mac. Although the APP file appears to be a single file, it is actually a folder containing other files and is often called an "application package" or "application bundle."The APP file extension is not just a Mac convention. It is also used with more than a dozen other programs in different operating system environments, including the Symbian OS.
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| Hardly A Single File |
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| The Firefox browser application (Firefox.app) in the Mac contains all these folders and files. The entire hierarchy is displayed here to show just how many elements can reside in what appears to be a single file, but is actually a folder called an "application package." |
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