OpenUrl not being called

Hi,

I am trying to receive a custom file format from the mail application and I have it all working except for the part where the application actually receives the file when the application is already launched.

From what I have read I was expecting that my OpenUrl method would be called when launched from another process but it doesn't appear to ever be called. If the app isn't running I am able to get a FinishedLaunching with options set.

Anyone have any ideas?

Testing on an iPhone 4S with iOS 7.0.4 using Xamarin Studio 4.3.1 (build 3).

Cheers, Clint