"unknown file type" when writing DVD (NeroAPITest)

Apologies as this is probably a rather stupid question, but here goes anyway.

I am using NeroAPITest to try to write a file to a DVD. Using the command

NeroAPITest --write --drivename f --DVD d:\cygwin_setup.zip

I get the error message

“unknown file type d:\cygwin_setup.zip”

Any ideas? Thanks in advance.

I think, you are missing the --iso flag.