If you want a zero-install experience, stick with the Autodesk Web Viewer . If you absolutely need an offline file on a USB, look into DWG FastView or ZWCAD Viewer .
: A free, web-based tool that works with over 80 file types, including DWG, RVT, and Solidworks. It’s perfect for quick client reviews and basic markups. For Desktop Users dwg trueview portable