This conversion seems to represent a translation of ISO STEP product data files (.stp, .step) to one of the many CAD format that uses .cad files to store the model or part data. This may be possible for more that one different .cad files, including the files produced by BobCAD-CAM Mil.
Convert ISO-10303 STEP product data to CAD drawing file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert stp to cad on Windows
A CAD-CAM software for CNC Milling
Convert from stp file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.