when I installing mac os , Every icon is showing .app extension.
migrated from stackoverflow.com Nov 23 '10 at 9:30
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There's a setting in the Finder to show extensions. Select the Finder, then go to from the menubar "Finder" > "Preferences", then click the advanced tab. The checkbox "Show all file extensions" is usually deselected by default, having it selected will cause the Finder to always show files with extensions such as