Change url file associations in OS X

There are many custom protocols where a command can be an URI.
For example ical://some_new_event or mailto:john@malkovich.com or magnet://
There are system wide associations in OS X, but there's no interface that can edit them. Only some applications can do that, but then the control is not in your hands. Here's how:

Download RCDefaultApp - this is a preference pane for System Preferences:

Screen Shot 2013-04-10 at 11.21.17 PM

The last one, when opened, looks like this:

Screen Shot 2013-04-10 at 11.21.46 PM

Change and save!

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