lol, thanks.
The first link solves a problem when someone cant open a dwg file at all. Not my issue.
The second link describes it working the way it does work for us, that is the DWG tries to send the file to the AutoCAD web service, but that is what this question is about. I do not want to use the AutoCAD web service. I just want to open the SharePoint based file in TrueView or AutoCAD depending on what is installed on the local PC. Apologies if I was not clear in my original question.