You should be using the legal message values in the winlogon registry key. This is part of the OS.


:SetLegalMessage
    ; The corporate Legal Message is written to the registry. The local LAN Admins can submit
    ; language specific text which will be used automatically.
    ;
    ; The language specific text must have the following format. Us notepad.exe to create a text
    ; file. The first line will contain the text used in caption of the dialog box. The second
    ; line will be the entire legal message text. The ENTER key should be pressed after the second line.

    If $RAS=0 and not ProductSuite("Terminal Server") ;and $VPN
        Dim $String1, $String2
        Dim $RC1, $RC2
        Dim $RegKey
        Dim $Autologon
        Dim $Lang, $file

        $Lang = GetUserLanguageCode()
        $file = $Lpath + "\corp\legalmsg\$Lang.txt"

        if OpenFile(2, $file, 2) <> 0
            Writelog("Native language legal message not found: $file")
            ;$ErrorState set to 1 in OpenFile. Reset $ErrorState to 0 as not to display the error notification.
            $ErrorState = 0
            $file = $Lpath + "\corp\legalmsg\0409.txt"

            if OpenFile(2, $file, 2) <> 0
                Writelog("Error: Legal text not found. " + $file)
            endif
        endif

        $String1 = Readline(2)
        $String2 = Readline(2)
        $RC1 = close(2)

        Select
            Case $OS="WinNT"
                $RegKey="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\winlogon"
            Case $OS="Win9x"
                $RegKey="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\winlogon"
        EndSelect

        ; The legal message interferes with the autologon process and therefore will not be installed
        ; on computers configured for autologon.

        $Autologon=ReadValue("$RegKey","AutoAdminLogon")
        if @error = 2
            $Autologon=0
        endif
        If $Autologon=0
            $RC1=WriteValue($RegKey,"LegalNoticeCaption",$String1,"REG_SZ")
            $RC2=WriteValue($RegKey,"LegalNoticeText",$String2,"REG_SZ")
            if $RC1=0 and $RC2=0
                WriteLog ("Wrote legal message to registry.")
            else
                WriteLog ("Error writing Legal Message: LegalNoticeCaption error=$RC1, LegalNoticeText error=$RC2")
                if $RC1<>5
                    $ErrorState=1
                endif
            endif
        Else
            WriteLog ("Legal Message skipped because computer is configured for AutoLogon.")
        Endif

        If $OS="WinNT"
            $RC=WriteValue($RegKey,"RunLogonScriptSync","1","REG_DWORD")
        Endif
    Endif
    Return


Note that you need Admin writes to create or write to these location on an NT or higher OS computer. In that case, the message should be part of the build process.
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