As far as I know: WRX files are containers for OCX controls. If the OCX controls are 32Bit ( like the ones for example used in Dynamics ) then you can't use them with a 64Bit Progress executable like the prowin.exe that comes with OE 11.3. You need to stay with the prowin32.exe. Maybe the WRX files themselves are not bit-sensitive but the embedded OCX controls are.
Heavy Regards, RealHeavyDude.