Conversion of step files to prt file format

In case you have access to SolidWorks, it should be possible to simply import STEP product data (.stp, .step) to it and save as CAD part file (.prt, .sldprt). Other than that, some 3rd party CAD conversion programs like the CrossManager or similar can also help you with step to prt conversion.

Open STEP file    Open PRT file

Related software

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Solid Edge

A feature rich 3D CAD software by Siemens

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SolidWorks

A 2D and 3D CAD construction software