Convert 3ds to step

Download and install the latest version of Filestar.
Right click on one or more 3ds file(s) on your desktop and select Convert with Filestar.
Type convert to step in the search box.
Press Convert.

What is the difference between .3ds and .step?

Name: 3D Studio Max; STEP
Extension: .3ds; .step
Category: 3D; 3D
Developer: Autodesk; ISO
Description: 3DS is one of the file formats used by the Autodesk 3ds Max 3D modeling, animation and rendering software.; STEP is a neutral ISO-standard 3D file format that is used to transfer data between different CAD programs.
MIME Type: application/x-3ds; application/step
Sample: sample.3ds
Wikipedia: .3ds on Wikipedia; .step on Wikipedia