Apple Preview is the easiest way to view an icon file on macOS.
What Is an ICNS File?
They’re equivalent in most ways to the ICO files used in Windows.
One or more images can be stored within the same icon file, and are normally created from aPNGfile.
If you’re on a Mac,Snap Convertercan save the file as something else.
Otherwise, I recommend using the Icon Composer tool that’s part of theApple Developer Toolssoftware suite.
Still Can’t Open It?
Some files might at first appear to use this extension, when really it’s just spelled similarly.
ICS, INC (Total Commander configs file), and LCN (license file) are some examples.
They are very similar looking, but have nothing to do with Apple icon files.
Your file might instead be a document preset file that uses the ICST file extension.
If so, you needAdobe InCopyon your gear to view it.
