See if discussion in the thread #631926 can help you.

>Hello, some months ago, I asked this problem, but nowhereI have found the answer.
>
>VFP6 had a good api sample that makes possible to create VFP specific Active-X controls.
>VFP7 has some trouble with this area, because requires extra libs that is part of VS.Net, only. (As I know.)
>Because today is the day of VS.net launch, I ask the question again to anyone having .net:
>
>It is real, that compiling by VS.net C++ the "Missing ATLS.Lib" error message disappear when compiling any Active-X using VFP7 api library _OCXAPI() function call?
>
>
>But I go further. Why isn't VFP7's exe files compatible with Active-X-es compiled to VFP6? And why are they compatible in developer enviroment?
>(It was the same simptom with VFP5 to VFP6 upgrading)
>
>Any comment appreciated
>
>bb