> I want to replace my Firebird 32 1.5.6 with the last Firebird 64 2.5.3,
> on 64b
>
> All my databases was created with 32b, 1.5.6 Firebird.
>
> After installed Firebird 64, if a try to connect to database.FDB a
> received an error
>
> "database./fdb is not a valid database/".

Beside the other recommendations, before switching from Firebird 32-bit
to 64-bit, make sure that you aren't dependent on a UDF library which
exists only as 32-bit version.



--
With regards,
Thomas Steinmaurer
http://www.upscene.com/

Professional Tools and Services for Firebird
FB TraceManager, IB LogManager, Database Health Check, Tuning etc.