Setting MAINFRAME_FLOATING_POINT to anything other than "true" has the same effect as setting it to "false".
The setting of this environment variable can be overridden by the NATIVE-FLOATING-POINT directive. See NATIVE-FLOATING-POINT for more information.
You must set the MAINFRAME_FLOATING_POINT environment variable from a Net Express command prompt before you start Studio Enterprise Edition for it to take effect.