Several online file conversion tools now support ArtCAM files. You upload an .art file, and the server converts it to STL, which you can then view in any online STL viewer (e.g., 3DViewerOnline).
Autodesk used to offer a free standalone . It was perfect for shop floors: you could rotate 3D models, turn layers on/off, and even measure distances.
Relying on an “ArtCAM file viewer” is a temporary fix. The best long-term strategy is .