Implement this method to return the path to an icon file which will be displayed in Revit user interfaces associated to this server. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2015 
Syntax
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Return Value
The image file of the server.Remarks
The specified image will be displayed in the browser dialogs when the user is selecting a resource of a compatible type.
The return must be the full path to an icon file containing 48x48, 32x32 and 16x16 pixel images.
If this method returns anything other than a valid icon file, a default image will be used for the server.