Hi Josh,
Thanks very much for your reply.
I guess I will associate DFX files with DeskFX as the solution.
The only reason I would prefer to use a command line option is that DFX files can also be a AutoCAD filetype so I wanted to avoid associating the DFX filetype with DeskFX.
I have just added the suggestion via the link you provided.
Thanks again for your prompt reply!
Regards,
Flavio