Sorry.
The following does not help. I can't figure it out.
Why do you need to do this using the Command line?
See Command-line switches for Microsoft Office support page.
Example To start Word with a document based on a template called Myfax.dotx, stored on the C drive, type the following at the command prompt:
winword.exe /tc:\Myfax.dotx "C:\Documents\MyNewDocument.docx"