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Solved by Lance.Coffey. Go to Solution.
I checked my system, and the Mass.rft file is in the following folder:
C:\ProgramData\Autodesk\RVT 2014\Family Templates\English_I\Conceptual Mass
I have seen a repair load missing families, so that is something you could try.
Since this file is relatively small, I am attaching it to the thread.
Well thanks, but thats not the adaptive mass family type though thats just "mass".
When I found the Conceptual Mass family, it looks like I forgot about the Adaptive part of your question.
In the 2012 release of Revit, the template file "Adaptive Component.rft" was renamed to "Generic Model Adaptive.rft" and moved into the main Family Templates (English_I) folder.
It has remained in that location since the 2012 version and is still available there in the 2014 version.