Why does CommX not work with Visual FoxPro 5.0 after installing Service Pack 3?
Service Pack 3 switched the dual interface capability to “OFF” as the default for Visual FoxPro. Because CommX is a dual interface ActiveX control, you will need to work around as follows (or update to VFP 6.0) Follow the steps below to allow the dual interface capability of CommX. 1. Modify the Load Event Form 2. Add the line =SYS(2333,0) OR 1.