In most cases a dxf to prt conversion represents attempts to transform or use DXF CAD drawing (.dxf) to a CAD part (often .prt). This is doable, but it relates to 2D to 3D conversions of CAD data, i.e. generating a 3D model (part) from 2D design described in the .dxf file. Many professional CAD / 3D modeling tools should be able to handle this type of data CAD conversion.
Open DXF file Open PRT fileA CAD converter with huge format support
A 3D CAD, CAM, and CAE designing software by Siemens