Michael - ProvideX.ddf is for framework ODBC and PRFILE.DD is P/R legacy ODBC. You can DFDM PRFILE.DD in fact. You may need to change the key search in the bottom left of the DFDM screen so you search by alphabetical order of file name. Or you could try the DFDM Print button.
About the other thing when a SOTAMAS90 ODBC connection is made the first dictionary is ProvideX.ddf to get the file names (and DDE for the field names) but it knows to also looks under /DDICTS folder for legacy dictionaries.
The xxFILE.dd has the Legacy file names (look for PR_AD record) and xxFLD.dd has the field names.
In the end if you verify it's missing why don't you just shoot off an email to the M/D asking if they can add it?
I don't know your situation or relationship but I say the above nonchalantly because this issue has happened to us too (where we were the M/D) and coincidentally for a P/R mod. We remoted in to the client, dropped a tool in, added the missing table and fields to the PR DD files, removed the tool, all was good. Then later we updated the build and sent the new installer for the mod to the client in case they ever needed to reinstall.