The OOTP .odb format has undergone changes throughout the history of the game. So, the format of something created 15 years ago is no longer going to be compatible.
I have not used it and can't tell if it is currently up to date, but there is a community utility out there for working with/converting versions of the database files.
https://forums.ootpdevelopments.com/...d.php?t=331147