If you need to share your ArtCAM work with someone who doesn't have specialized software, you can convert your models within ArtCAM or Carveco: 3D Reliefs:
While not a free standalone viewer, if you own Vectric software, it serves as a verified, high-performance environment to view and modify your ArtCAM reliefs. Beware of "Free Online Viewers" artcam file viewer verified
If you only need to view the geometry, try to have the original file exported as an STL file. This format is universal and can be viewed by almost any free 3D viewer, including built-in Windows 10/11 tools. If you need to share your ArtCAM work