How to create and set an application icon (cocoa)

1. Run Icon Composer (part of XCode)
2. Drag your image(s) in, until it looks like this
   and
   and
   
3. Now save it into your project folder like this:
   
4. Set the Icons-File-name in the properties:
   
5. Drag the Icons-File into your project's Resources:
   
6. If everything worked, it looks now like this:
   and
   

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