Download 3DX Player
  3DX Player is the ActiveX control for viewing 3DX files. You can embed it in Microsoft Internet Explorer™ or any Microsoft Office™ products like MS Word and PowerPoint. It is a high-speed real time rendering using Direct3D and OpenGL. 3DX Player is absolutely license free!  

   3DX versions download
- 3DX version 1 -
basic 3dx player (active x version)
download here
- 3DX version 2 -
3dx player upgrade (cross-platform multi-browser)
for windows
for mac