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I'm working on an application which should handle particular URL types (liked ed2k for emule or magnet for torrent). Recently, I decided to change this URL type from abcd to a more speakable word. Using RCDefaultApp, I'm able to change (or disable) the URL handler, but not to remove the protocol from the list. I was wondering how to delete that old entry. I'm using Mac OS X Snow Leopard.

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Edit ~/Library/Preferences/ Property List Editor (part of Apple's developer tools) and remove the entry in LSHandlers with the LSHandlerURLScheme in question.

E.g. you'd select and delete Item 12 if you wanted to remove mailto associations on my system:

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