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Convert a Windows ico file to a Macintosh icns file

I needed to convert a Windows platform standard ico format icon file to a Macintosh icns format icon file and didn't find any quick relevant details via Google.

Well, here is a little quick recipe for doing so without having to use any additional software, only what is already on your Macintosh. At least this worked just fine on my Leopard machine so it should at least be able to be done on Leopard and Snow Leopard.

From the command line do the following, substituting in your relevant information.

pookie:tmp admin$ sips -s format tiff icon.ico --out icon.tiff
pookie:tmp admin$ tiff2icns -noLarge icon.tiff icon.icns