I am pretty sure most of us are working in 2014 and older.. I'm not sure what "Add-On" you are referring to , but this is what I've got installed currently(2014).
So which option adds this to windows explorer?
Autodesk 360 for AutoCAD
Migrate Custom Settings
.. adding all the samples
or
Visual LISP (R) Tutorials
Cuz if it's none of these.. Then it ain't in 2014