If someone likes to get information regarding Brieve's File format, a friend of mine has posted a complete header for native I/O access to read Btrieve files (
How to detect Btrieve Page Size).
Also if someone wants to completely read a file without the engine you can check the sources of Btrieve File Saver Utility (
SourceForge.net)
Hope that helps a bit....
cheers
Malton