Problem with Wingz external functions on PC

Hi everybody, I just have got your address via xarchie and so on ... I have a big problem with Wingz in the PC world. I am used to it under Unix and calling external functions is not a problem for me. But I have some code to write on a PC with Wingz and I tried the exemples of external functions given with the distribution disks (MyDll, MyMath....) without success ! I always get "Error 61" or "Unable to call function" messages. WHY ? My "get external xxxxx" seems to work correctly, the same for "remove external". I would be very happy if somebody could explain me what to do, because I tried to contact Informix France without any success.... Sorry for my very poor english PERU Michel European synchrotron radiation facility peru@esrf.fr