Vince,
Could you possibly mean the Data Models that are a part of the different systems? There was a Data Models Guide (Item # A73CEADM) that was available and now I believe that each application has an appendix that contains the Data Models for that application. The Data Models show the relationships between the files and other application files, and can be a help in understanding JD Edwards World Applications.
As to File Sheets, that must be something that an instructor developed for a World Writer class or seminar. I haven't seen anything but I will check with a coworker that attended the World Writer class earlier this year.