Once you know where the flat file database is, you can add fields like this:
1. Find the *.hdr file associated with your database. 2. edit this, adding tab delimited fields you need 3. edit your administrative scripts to handle the new fields 4. To get the new fields recognized, I found I had to run the following command in my script:
[closedatabase database_name]
After doing that, the database refreshed fine, and stored the new fields added.