I can read step files but not sldprt ones. Is there a free converter somewhere I can use to do this, since I do NOT have Solidworks?
Use GrabCAD Workbench. Upload you sldprt file to workbench then you can right click on the uploaded file and select "download as". You can download the file in the format of STEP, IGES, STL, Parasolid, ACIS, JT, or VRML.
If your still struggling I'd advise you to check out my tutorial for converting files in Workbench
How to convert CAD files in Workbench
I had the same problem and would like to thank you for (unlike the other responders) reading and answering the question asked,
From SolidWorks use save as menu, too convert another file formats..
Assume if she/he can not read sldprt that she/he doesn't have SW....