SolidWorks and other CAD programs probably can convert CAD part *.prt files to it' own *.sldpart CAD files. Should be easy enough and work without any problems.
Convert CAD 3D part or component to SolidWorks CAD part.
We found 3 software records in the database related to .prt to .sldprt file format conversion.
Microsoft Windows software - convert prt to sldprt on Windows
A 2D and 3D CAD construction software
Convert from prt file format
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 prt to sldprt. 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.
A CAD converter with huge format support
A CAD visualizaton, analyzation and translating system