Phantasy Star Online

I decided just for the heck of it to play Phantasy Star Online, but I can't find my save files anywhere. My copy works with my Dreamcast, so thats not the problem. I just happen to lost my save files. I decided to download save files to my computer and transfer them to my VMU, but since the saves don't match up with my copy they don't work. Can I use a hex editor to make the changes to the new saves? Do I have to download the saves directly from the internet to my Dreamcast?