Convert STP to 3DS

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STP/STEP is a fairly common product data CAD format so it is likely many 3D/CAD programs can import it and then further export to some other 3D format, like the 3DS from 3Ds Max (previously known as 3D Studio Max). Plenty of programs nowadays support 3DS format, so it shouldn't be hard to find one capable of stp to 3ds export or conversion.

Open STP file    Open 3DS file