there is something strange with icon of my document in cocoa. In Target - Info - Document Types, I set up png icon which is 512 x 512. When I run my application, save my document, there is white icon on my document, not which i set. Any ideas?
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Your PNG file might not have a properly premultiplied alpha channel. How was it generated?

Wil Shipley
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I user Sketch application for Mac – Nikita Zernov Jan 11 '14 at 15:05
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Can you include a screenshot of your Xcode settings and how the icon looks on your desktop? – Wil Shipley Jan 12 '14 at 01:06