Fixed the registration of mission control

Fixed the registration of mission control for a fresh installation of rt without a settings.cfg. 

Fixes #174 
Does this actually work if `this.Guid` is uninitialized? All of the [constructors for Guid](http://msdn.microsoft.com/en-us/library/system.guid.guid%28v=vs.90%29.aspx) throw an NRE if given a null argument.