We actually have something like running in production. I just posted a small part that seemed relevant. We launch a batch file. Posibbly the command line with parms was written to the batch file before the file:// that invoked the batch file.
That may be simpler to implement write batch files with the parms in them and then file:// to the right one for the circumstance.
I do not know a great deal about HTTP stuff. Just know we did some thing like what the poster wanted and tracked it down in case it helped.
