doc iconU3d extension means Universal 3D technical drawing file. These can be opened by Blender, Poser or Daz studio softwares.

u3d stands for 3d drawing files.

Universal 3D file format came in force in 2004. U3d files include 3d models, shapes, lights and coating materials. 
U3d files can be opened by updated Cad (technical drawing) softwares. Also we can recommend Blender, Poser or DAZ studio softwares. 
We want to remind that Blender 3D is a free software. You may get it free via internet.

What to use u3d

Blender, Poser, DAZ Studio

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