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I'm facing an issue with Transmission's "Set Default Application" button - it seems to do nothing. Magnet links still don't work, so this feature is broken for me. I have been able to use Magnet links with uTorrent prior to switching to Transmission, so I know there's no issue there.

Is there an app or any manual way to set/change protocol associations without having to use the target application to set it?

I'm using Transmission 2.42 (13013) running on OS X Lion 10.7.2.

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up vote 9 down vote accepted

RCDefaultApp is a Preferences Panel which allows you to edit the default application used for various URL schemes, file extensions, file types and MIME types.

enter image description here

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Perfect! Thanks a lot! It was already the default app, but the UTI setting wasn't enabled and that seems to have done the trick! – aalaap Oct 23 '11 at 9:45
Worked for me, thanks – Anthony Mayfield Feb 28 at 19:27

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