The full path to the Revit Macros module. 
   Namespace:   Autodesk.Revit.DB.Macros  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Implements
IEntryPoint AddinFolderRemarks
 This path should be used instead of the .NET GetExecutingAssembly() result, because the Macros module is loaded in such a way to make that result unreliable.