MX 2004 does not support multiple pages or the Master Page concept. You would have to export each page in your file as separate file, in order for them to open in MX '04. Even then, FW might retain the master page in those new files, so you'd need to copy remove the Master Page layer, making sure that any content from the Master Page is retained in the single page version.
p.s. I honestly can't rememebr if CS3 used pages and Master page concepts either. It's been a long time since I used that version. Are you saying you cannot open the CS3 file in MX 04?
Message was edited by: Jim_Babbage
Thanks very much for you reply.
Yes I cannot open CS3 files in mx 2004.