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A package looks like a file
Authored by: MJCube on May 05, '09 10:39:00AM

Changing the extension simply makes it a package, which the Finder displays as a file, but the System knows is a directory. When you double-click a package, the System knows what kind of file to look for within it, and opens that. In the case of Pages, there's an "index.xml" file. For apps there's [app]/Contents/MacOS/[app name].

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