J have an VFP 6 application exe and J want to use HtmlHelp API function for calling my Help.cnt file:

DECLARE INTEGER HtmlHelp in hhctrl.ocx INTEGER hwndCaller,;
STRING pszFile,INTEGER uCommand.INTEGER bwData

On F1 J am doing :

=HtmlHelp(mainhwnd(),"Help.cnt" ,1,0),

but J get next error: "Too many arguments".
What is wrong here?
Regards.