Converting a .Z3 file to .stp or .3DM format

Hi all, I previously used a CAD program that was using ZW3D software. I have moved back to Rhino a few years ago, with great success, but here is the problem: I now need to access some of my old designs that I saved as .z3 files. I no longer have a license for ZW3D. Can anyone recommend a conversion software/plug-in that can do this or provide the service of converting my files from .Z3 to .step/.stp/.3dm files please? Much appreciation, Jean-Thereze

Maybe this?

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