Reading and sending the file in C-Script should not work, because C-Script uses formatet reading afaik. But it's possible in C++ via the ios::binary flag, search in good for fstream.

If it's not like a said and C-Script gets the bits unchanged, this should easly be possible. Just do like HPW told you, open the file, read it into a string and send the string. At the other clients, create a black bitmap and write the data to it.