How can I add buttons to a file icon in the Finder?

How can I add a button to a file icon in the Finder, like those for PDF files?

See the ar开发者_JAVA技巧row buttons in this picture:

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The buttons are generated by a QuickLook plug-in. To get an interactive preview like this, you will need to create a QuickLook plug-in for your app.

You will need to use the HTML preview type and generate HTML that contains buttons and images yourself.