>I have a visual foxpro application protected by safenet centinels (rainbow). Previous version work with parallel centinels and works ok using a sxfoxpro.dll writen in C. The new models are usb and comes with a UltraProCom.Dll maybe writed in C++. I declare the functions with declare dll instruction but always get an error "cannot find entry point ..." in all the functions. I try to open the dll with the object browser and loads ok and i can see all the functions.

You cannot open a Windows DLL with VFP Object Browser. You can use Dependency Walker to explore it. Only a COM DLL can be opened with VFP Object Browser. Did you check documentation?