I just made a new 200MB (200000000 byte) file in WinHex, saved it as shadowc.img, and transferred it over as E:\shadowc\shadowc.img (or whatever your setup has it as. Leave the file zeroed out in WinHex and it should work fine.
I'd imagine there are lots of other programs you can use as well but this way is pretty simple and it worked fine for me.
Nice.