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You will need a .icns file, size 1024x1024.
.icns
1024x1024
If you're not sure where to start, begin by creating a 1024x1024 .png file, you can convert it with a tool like png2icns.
.png
Once your icon is ready, move it to YourApp.app/Contents/Resources/nw.icns, by overriding the existing one.
YourApp.app/Contents/Resources/nw.icns