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How can I change application icon (launcher icon) for my Qt-application? Now it looks like a question mark and I want to change it.

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Could you please be more specific so others can help you? Do you have the code somewhere we can have a look at? Have you set up a .desktop file? Where is your app's icon currently? – David Planella Jun 8 '12 at 14:42
I don't have .desktop file. – tucnak Jun 8 '12 at 15:27
up vote 1 down vote accepted

The icon used in the Launcher will be the icon specified in the application's .desktop file.

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