I asked and no it isn't X.
MB was done in Flash, so unless they created some ExtendScript functions to call MB ActionScript, there's no way to access it directly.
If you know the extension id of MB (shouldn't be too difficult to figure out), you can invoke MB (i.e. open it), and possibly invoke some of its functionality...
I figured as much. If I get anything worked out, I'll drop a note here.