<https://www.cadtutor.net/forum/topic/64635-convert-cad-file-to-dwg/#comment-532585>
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"Yeah, I'm thinking it is AutoSketch as well but I just checked and I read that it used the SKD and SKF file formats initially but at some point also supported DWG and DWF.  Not too sure how accurate the information is however. \n  \nCould it have been BobCAD (CAD-CAM program)? \n  \nOK...so I checked as to what file formats BobCAD supports and .CAD is one of them (file must be imported).  So, if one could download and install a trial version of BobCAD it might be possible to import the drawing then save it to a DXF file format which can then be opened in AutoCAD. \n  \nFree demo version available here...http://bobcad.com/free-cad-cam-demo-downloads/?source=DEMO_TOPNAV \n"
<https://www.cadtutor.net/forum/topic/64635-convert-cad-file-to-dwg/?tab=comments#comment-532583>