ICNS
From Just Solve the File Format Problem
ICNS is the native icon format of Mac OS X.
It goes by many other names, including Apple Icon, Macintosh Icon, Mac OS Icon, Macintosh OS X Icon, Mac OS X Icon Resource, Mac OS icns Resource, and IconFamily Resource.
Supported image sizes are 16, 32, 48, 128, 256, 512, and 1024 pixels square.
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Identification
Files begin with ASCII characters "icns".
Related formats
Some ICNS files contain icons in the form of embedded PNG or JPEG 2000 files.
