If you have access to SolidWorks you can simply import STEP product data (.stp, .step) to it and save as part file (.prt, .sldprt). Other than that, some 3rd party CAD conversion programs like the CrossManager or similar can also help you with stp to prt conversion.
Home > Search converters: stp to prt
Conversion of stp file format to prt file format beta
Search for stp to prt converter or software able to handle these file types.
Convert ISO-10303 STEP product data to CAD 3D part or component.
We have found 5 software records in our database eligible for .stp to .prt file format conversion.
Microsoft Windows software 
- convert stp to prt on Windows
Solid Edge
A feature rich 3D CAD software by Siemens
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from stp file | No | No | No | No | No | Yes | Yes | No |
to prt file | No | Yes | Yes | prt editor | Yes | No | No | 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 stp to prt. 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.
SolidWorks
A 2D and 3D CAD construction software
NX
A 3D CAD, CAM, and CAE designing software by Siemens
Creo Parametric
A complete 3D modeling software solution by PTC
CrossManager
A CAD converter with huge format support
Additional links: Open stp file, Open prt file
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.
PRT
Files with prt extension are generally used in the CAD industry for 3D designs of parts or components and are used in many programs, although often in different formats.
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