UFT 12.5 Runtime Engine

Is there a way to add a user created add-in to the runtime engine.  We had to create our own add-ins for one of our products so it could interact with their controls.


We are testing the runtime engine and we can't find a way to import that add in.  It does not recognize the add-in inside the settings.  In the full UFT we would copy the XML to


C:\Program Files\HP\Unified Functional Testing\dat\Extensibility\Web\


And copy the add-in folder to


C:\Program Files\HP\Unified Functional Testing\dat\Extensibility\Web\Toolkits\


And when the start up add-in screen woudl appear when opening UFT - the add-in would appear under web. 


It doesn't appear as an option for the runtime engine settings.