My designer used measurement data from our house to create a CAD file, a copy of which he sent to us. The software that he used is called AutoCAD. Is there another software program (perhaps free?) that will allow us to view the file and take dimensions off of it? We plan on adding a full wrap around covered porch, adding dormers to the attic and lowering basement. I would like to covert those measurements into design ideas on my own. Thanks in advance!