Is there any software that will let me do this? Hidownload and nettransport don't seem to support the option. Here's what I'm feeding hidownload:

mms://server.site.net/directory/wmv_filename.wmv?.rar=43211234-aaaa-asd4-0011-12345678909A

I have a starttime flag but when I try to use it it still just dl's the whole video.