Hi Tim,
Can you elaborate on how to make those .shps associate with ArcGIS? I apparently need to do this in order to use iTree Canopy- it insists on .shps and it seems that the 'AutoCAD Compiled Shape' association thing makes i Tree canopy think the .shp is an invalid file format.
So here's my question: what aspect of ArcGIS do I need to navigate to? I know my ArcGIS is installed under my Program Files (x86), but there's a million different parts of ArcGIS there. What an I looking for, exactly, to associate the .shps to?