unix path will have forward slashes instead of backward slashes:
/testfolder/testimage.jpg
Linux will not understand the "D:" part either.
ftp is probably the easiest way to go (as previous poster mentioned)
if you are going to be doing this a lot, the best solution might be to have your sys-admin mount the linux drives onto your pc.
Our company uses the freeware from samba.org to do this.
enjoy!
Scott
[ August 22, 2006: Message edited by: Scott Cook ]