I understand. I know of a very large accounting package that used an extremely old version of Btrieve for many years after it went unsupported only because they didn't want to move to the newer version.
One thing you might try if you are willing is to take a test server, install the PSQL v11 server, copy the data over to the test server, and try the application with the v11 engine. Your vendor may not support it but you would get full access to the newer options including a better ODBC driver, ADO.NET, and better SQL engine.
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Mirtheil Software
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Custom Btrieve/VB development
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