ArtCAM files, specifically those with the extension, are proprietary to the ArtCAM software suite (formerly by Delcam and later Autodesk). Because the software is no longer officially sold by Autodesk, finding a dedicated "viewer" requires using either the legacy software itself or specific compatible alternatives. ArtCAM File Formats
After Autodesk discontinued ArtCAM, the original development team launched . Carveco offers a completely free Carveco Viewer (formerly “Carveco for Hobbyists”). artcam file viewer
ESTLcam is a tiny, free Windows utility originally designed for STL files, but it can also open files (ArtCAM reliefs). It renders the surface as a shaded 3D model. Example: 1