OK, Larry and thanks for your detailed explanations, but it simply does not work... The Coyote Forte .dll is well in the Coyote Forte folder, where it has been from begin on (and there is a copy of the .dll in the BiaB folder). In any case I have re-installed the coyote under the same folder in my programs list (where it always was).

I have renamed, in the BiaB folder the configuration DXiPluginlist, so it should not be there for BiaB to look at.

(When I open in BiaB the option/Midi set-up, I HAVE the coyote Forte apearing at the top of the Synthtiser/Sound card column).

Now, when I try to re-scan (under options in the VST/DX Synths), nothing happens. When I try to "add" a new VST plugin and try to open the Forte .dll, I get a screen telling me that Forte is not a valid plugin and that's it. (Same happens if I try to do the same with the TTS.dll).
Bernard