This page does not mention inkscape.com versus inkscape.exe. I wasted many hours yesterday, eventually discovered this: http://kaioa.com/node/63 and this morning after discovering this http://stackoverflow.com/a/8030880/95195 I realized my problem is I was executing inkscape.exe and not inkscape from the command prompt.

I'd like to clarify the issue so others do not go down the same path.