SysWoW64

Here is something that recently helped me fix a issue.

For a 64 bit Operating System, Microsoft offers a set of 32 bit executables in the WoW(Windows on Windows) directory of the system.

To setup DSN for 32-bit application you must use:
%WINDIR%\SysWOW64\odbcad32.exe

and for 64-bit application you must use:
%WINDIR%\System32\odbcad32.exe

So, to run a 32 bit application, we would need to modify the env PATH variable and put SysWOW64 before system32.

Roughly the steps would be
1. Start %windir%\SysWoW64\cmd.exe
2. set PATH=%systemroot%\SysWOW64;%PATH%
3. Run the application.
4. After application has completed, reset PATH variable if required.


Hope this was helpful.
Or, if the application can't be run from a shell then you could modify the PATH variable directly from System Properties > Advanced Tab > Environmental Variable > System variable.
Edit the PATH variable accordingly and reboot the system for the changes to take effect.