based on
https://github.com/arekm/rsdoc-to-sat

Convert DesignSpark Mechanical DSM rsdoc file to sat file which can be loaded into MoI3d
Installation -> python3

drag & drop rsdoc file(s) onto rsdoc-to-sat.py file
.sat file(s) will appear in the same directory as rsdoc file(s).

author went via winreg path, i've changed path inside script to full path ~
inside script change path of sabsat to full path of SabSatConverter.exe (it comes with full DSM installation)
~
sabsat = "C:\\Program Files\\DesignSpark\\DesignSpark Mechanical 4.0\\SabSatConverter.exe"
~