The fileinfo.com site either has outdated or incorrect info, as the current Blender and DazStudio don't allow import of U3D.
The only application I found that does open it is Simlab Composer, and while its not free, it is low cost.
A viewer that may work for you is Sketchfab. Looks like they have a plugin for SolidWorks, and they do have free accounts although your usage would determine if a paid account would be needed. This does not use U3D format.
you can embed u3d files into any TeX document.
and the function:
But your question has become obsolote since there is no more support for u3d since 2015.