Attempted to execute from Windows 2008 R2 server, but it appears it won't send special characters (eg. shift, Windows key), so it doesn't execute anything. It is able to still send normal letters though.
I did have to change AxMsRdpClient9NotSafeForScripting to AxMsRdpClient6NotSafeForScripting, as it's latest supported version on Server 2008. Also tried changing other settings with no success.