It should be quite possible to convert CAD data from ISO STEP product data files (.stp, .step) and save them as a 3D CAD format (.3d) which is used by several CAD programs. Most likely used for 3D modeling purposes, to transfer models between different programs. Such stp to 3d conversion can also be achieved with some dedicated 3D converters.
Open STP file Open 3D file3D viewer and converter with huge file type support