There are some way to know, by the icon, if it's a package (like a .app) or a single file? I'm talking about some app or config that adds a flag in the icon, or something like that.
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Control- or right-clicking a package in Finder will show the context menu item
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Open the Finder. In Finder's preferences go to 'Advanced' and tick 'Show all filename extensions'. After you do this if something is an application it will have a .app after it's name.
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