Dataflex 18.1 - 19.0

Hi,
I have developped Dataflex application on a Windows 7 Pro 64 bits.
The SQL server is a SQL express 2008 R2

This application has been compiled on Dataflex 18.1.
I have tested it on another PC Windows 7 Pro 32 bits as Server. The data's are on the 64 bits PC.(SQL express 2008)
It ran without any problem as well windows application like Web application.

I have upgraded the runtime to 19.0, compiled and tested it without any problem on my PC 64 bits.

When I try to run the application on the PC 32 bits (used as server) after having upgraded the runtime to 19.0, I receive this error message :
Code:
Impossible d'ouvrir la table. Minimum client version not found. 
Minimum required database client version = 10(SQL Server Native Client 10.0),
(highest installed database client version = 8 (SQL Server)
It ran in the same environment on 18.1.