What is the format of the three-dimensional data of the highest share in the world?

If the 3D data which can be modified by cheap (or free) three dimensional CAD is uploaded here, many people can modify the data easily, I guess.

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2D drawings usualy are in DWG or DXF
3D models vary a lot, the most used neutral files are STEP/IGES, STL and U3D

 
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