You can save Read/Write Rules as a .fm document or as a text file.
When saving your EDD as a DTD the product asks for a structured application and in the definition of the structured application (in structapps.fm) you have to specify the path to the read/write document. If you used backslashes to do this, either double them or use forward slashes, because FrameMaker treats some combinations of backslash + character as a special character.
BTW, don't forget to delete all extra R/W files.
- Michael