How to convert 3ds to step?

I use a Simulator Soft to create PCBs. This soft can create a 3D view and can save it as a .3ds file. I use Rhino to modify the created .3ds but Rhino is unable to export .step.
I need to convert the .3ds to .step but all converters I have tried are absolutelly usefull.
Any suggestion?.
Thanks for your time and attention.

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When u are saving a file there comes option just below the name of the file click on the arrow and there will be given two formats to save the file STEP and STP. Both will do the same works and there is very slight different between these two formats of saving the file

 
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