The MAILTO: protocol doesn't support atachments. You can use MAPI Mail Class File #9524.

>Window XP, VFP9, Outlook Express 6
>
>*****
>DECLARE INTEGER ShellExecute IN shell32.dll ;
> INTEGER hndWin, STRING cAction, STRING cFileName, ;
> STRING cParams, STRING cDir, INTEGER nShowWin
>
>lcMail = "mailto:" + EMAIL_TO
>ShellExecute(0,"open",lcMail,"","",1)
>*****
<snip>