The name "CAD FORUM" confuses the reader. Meaning of CAD acronimum is not equal to AutoCAD or Autodesk products. Please, find the appropriate name.
I wish a lot of success to your FORUM in the future.

Thanks for your input. We are aware that "CAD" and "Autodesk" are not equal terms but even with focus on Autodesk products we do write about "CAD" here. We have currently no plans for changing the name of this service (running already for 10 years).

[QUOTE=Vladimir Michl]Thanks for your input. We are aware that "CAD" and "Autodesk" are not equal terms but even with focus on Autodesk products we do write about "CAD" here. We have currently no plans for changing the name of this service (running already for 10 years).[/QUOTE]
I have proposal: AutoCAD Forum. It is correct to give Forum name as clear as possible.

How do I create a dfm file in LDD?

The name seems fine to me.  It is about CAD, not just AutoCAD.

Autocad name is fine for this forum title

It seams that AutoCAD has taken over the word CAD.  I think the reason is the Highschool drafting departments are teaching AutoCAD and they call it CAD.  The students just pick that up and go with it.