Question: who to open dwg file?
Answer: You can either use Autodesk DWG online viewer or download DWG TrueView. DWG online viewer is available at https://viewer.autodesk.com/ - it can import DWG, STEP, RVT and Solidworks files and show it in your browser. You can download DWG TrueView from https://www.autodesk.com/products/dwg.