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2.8. Bundles

Under the hood, folders are actually Unix directories. However, not all Unix directories on the filesystem are folders; some are bundles, holding application resources or special multiple-file document types that the Finder doesn't think you really need to know about. For example, many of the programs in the Applications folder are bundles, though they may appear to be just a single file in the Finder. Other examples include:

  • Rich text documents you create with TextEdit that contain images and graphics (which end with a .rtfd extension).

  • Keynote presentation files (which end with a .key extension)

  • Data contained in a backup set, created with .Mac's Backup application (which end with a .backup extension)


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