>If I remember well Navision Financial is written in VFP.
>Pegasus Opera Accounting software is written with VFP too.

I went up to the products server, and didn't see anything called "Navision Financial". However, the two products I did find (Attain and Axapta) don't look like they use VFP. However, Attain looks to have an SDK, and Axapta looks like it uses MSDE, which would easily be accessed via ODBC or OLE DB.