Opening 3dxml File
3dxml extension is related to 3D XML transport file. You can try to open 3dxml files with 3D edit softwares.
3dxml extension stands for data file. These XML based data files developed for file transporting between various 3d softwares.
You may find different versions of this file in zipped format. You have chance to run 3dxml files with 3d edit softwares.
Opening methods of 3dxml file
3d edit softwares like 3dsmax or Autocad or Free blender3D.
Links to opening 3dxml file