Returns an absolute path to the referenced file, regardless of whether the PathType.Enum is relative or absolute. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Return Value
A full path to the linked model.Remarks
 ExternalFileReferences which are taken from a closed document will report their absolute path as of the last time the document was saved.