The Xcode docs, explain that the CFBundleURLIconFile key contains the name of the icon image file (minus the extension) to be used for displaying URLs of this type.

My remaining questions are:

  1. What icon image should I use? Like, if the URL type is for another app, should I use that app's app icon?
  2. What size(s)? If many sizes, how do I name them so that the sizes are used correctly?
  3. Where is it displayed? I'm wondering for an iPhone app.
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