From Interbase 2007 to Firebird

[AtcBrambo]

Hallo.
For customer reasons I must come back to FB. I tried a way to backup data in transportable format using gbak and then restore with FB. But it doesn't work.
So I need to write an appication to pass the data.
The problem is:
since on the same application there will be two TIBDatabase I must tell each with client use, like this way:

IBDatabase_1 must connect using c:\windows\system32\gds32_IB_2007.dll
IBDatabase_2 must connect using c:\windows\system32\gds32_FB_1_5.dll

I use IBExpert and, i noticed this portion of code.

/******************************************************************************/
/*** Generated by IBExpert 08/05/2010 ***/
/******************************************************************************/

SET CLIENTLIB 'C:\Windows\System32\gds32_ib_2007.dll';

CREATE DATABASE 'ARCHIVIO_ELESTAMP.GDB'
USER 'SYSDBA' PASSWORD 'masterkey'
PAGE_SIZE 8192;

Is there any way to do the same thing while connecting from my applcation ?
I believe that It can be done, since IBExpert allow you to chose with client LIB use to connection to an existing database.

Best regards

Giovanni.