Your best option for working and converting of .3ds files would be 3ds Max, previously known as 3D Studio Max. Formats from this programs are rarely supported in 3rd party apps in their latest versions, however some dedicated converters may still read them and allow export (or at least limited export) to other 3d modeling formats, including the STEP standard (.stp, .step).
Home > Search converters: 3ds to stp
Conversion of 3ds file format to stp file format beta
Search for 3ds to stp converter or software able to handle these file types.
Convert 3ds Max (3D Studio MAX) graphics to ISO-10303 STEP product data.
We have found 9 software records in our database eligible for .3ds to .stp file format conversion.
Microsoft Windows software 
- convert 3ds to stp on Windows
3D Object Converter
3D viewer and converter with huge file type support
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from 3ds file | No | No | No | No | No | Yes | Yes | No |
to stp file | No | No | No | No | No | Yes | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 3ds to stp. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
AutoCAD
Leading 2D and 3D CAD development software from Autodesk
TurboCAD
A family of 2D/3D CAD software products for Windows
3ds Max (3D Studio Max)
A widely-used 3D animation application from Autodesk
Autoconverter
A converter for 3D formats
3D-Tool
A CAD viewer program with conversion capabilities
CAD Exchanger
A CAD conversion software
Apple macOS / Mac OS X software 
- convert 3ds to stp on macOS
TurboCAD for Mac
A 2D/3D CAD software for OS X
AutoCAD for Mac
A Mac version of popular Autodesk AutoCAD software
Additional links: Open 3ds file, Open stp file
3DS
Files with 3ds file extension can be commonly found as 3D computer graphics created using 3D Studio Max software as well its successor product 3ds Max by Autodesk.
STP
Files with stp extension can be typically found as CAD format in the STEP, a ISO standard for the computer-interpretable representation and exchange of industrial product data.
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