>As long as you're running the VFP app under Windows OS it wouldn't be a problem, so it's OK if:
>* If you run under Windows OS installed on a Macintosh.
>* If you run under VM running Windows OS.
>
>Running with Wine or WineLib on Unix/Linux would violate the EULA however.

It depends on countries laws and lawyers. If I paid money to VFP how can Microsoft has rights which OS I'll use? I don't know how it's at USA courts but in my country even you signed an agreement, unfair issues in agreement would be repudiated at courts.