Conversion of step files to sldprt file format

SolidWorks supports ISO STEP format (.stp, .step) by default, so you can simply re-save the part as .sldprt files. Alternative option is perhaps with 3rd party software which is capable of saving in SolidWorks' formats which, but thight might a little tricky for latest version of SolidWorks formats. However it should definitely be possible to perform a step to sldprt conversion.

Open STEP file    Open SLDPRT file

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SolidWorks

A 2D and 3D CAD construction software