Executing an Oracle 9i Client Process from OAS 10g Java Application

Sorry in advance for the long post:
We have a piece of legacy software (Uniface.exe) that contains a good chunk of business rules for an existing system. Uniface client connects to an Oracle 10g database but requires Oracle 9i client libraries. Therefore the default Oracle home for a local machine running Uniface is set to the Oracle 9i client software location.
On the same machine we have OAS 10g (10.1.3.1) running a Java-based middleware product (J2EE). The Java code invokes the Uniface.exe client to run specific business functions. We have in our Java code Runtime.getRuntime().exec(cmd); where cmd is the Uniface.exe.
It appears that when the OAS Java program executes the Uniface.exe it is using the Oracle 10g client libraries from OAS instead of the Oracle 9i client libraries from the local machine's default Oracle home. When we run Uniface.exe from a Windows command prompt it works fine.
We have noticed that when running Uniface.exe from Java OAS uses its own Windows path and environment variables and does not honor the system path. We wrote a Windows bat script to explicitly set the Oracle home and system path to the 9i location and then run Uniface.exe but this doesn't seem to work.
Any ideas?

OAS sets the ORA_NLS33 environment variable to the OAS 10g home location (F:\Oracle\10.1.3.1\OracleAS_1\ocommon\nls\admin\dat). Setting it to my Oracle 9i client location (C:\Oracle\product\9i\ocommon\nls\ADMIN\DATA) appears to have solved the problem.

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