AutoCAD will always "write", that is what it does.
If you need a DWG reader try the Autodesk web services https://viewer.autodesk.com/ or https://www.autodesk.com/products/autocad-mobile/overview or get a MAC based dwg viewer http://www.microspot.com/pages/dwg_viewer/index.htm or http://www.edrawingsviewer.com/ed/edrawings-viewer.htm among others out there