MAS: Installing your app icon - nwjs/nw.js GitHub Wiki

Refer to the official documentation by Apple regarding generating the icns icon here

You need to have matched the requirements or the Application Loader will fail.

• icon_16x16.png
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• icon_32x32.png
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• icon_128x128.png
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• icon_256x256.png
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• icon_512x512.png
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1. Create an iconset $ mkdir [name].iconset
2. Add all the PNG's to the iconset folder
3. Run the icon util $ iconutil -c icns <iconset filename>
4. Replace the app.icns and the document.icns file with the generated icns inside your.app/Contents/Resources