Hi Cheung, Are you using the Pro/E WF 3.0 University Edition or the free Pro/ENGINEER Wildfire 4.0 Schools Edition? The reason why I ask is that the free edition does not allow TK input. As for the University Edition...it does allow TK programming and execution. That being said, Microsoft Visual C++ 6.0 is no longer support on WF 3.0. You can try it, but I cannot confirm if it will work. It is not tested or supported with WF 3.0. Sorry for the inconvenience. Regards, Mark