These newer versions of Oracle have never been certified by Oracle with these older product releases such as Net Express 3.0.
The 173 error on SQLADR can normally be resolved by using one of the following methods:
1. Add the LITLINK directlive to the compile and then add the Oracle library to the link step.
On my system the Oracle library can be found here:
C:\app\crg\product\11.2.0\dbhome_1\precomp\LIB\orasql11.lib
where crg is the user name and dbhome_1 is the Oracle home.
or
2. Add the directive INITCALL"ORASQL11" to the compile
Thanks