The following code crashes my mIRC 6.16 and errors on mIRC 6.17

Code:
//comopen html htmlfile | !.echo -q $com(html,URL,4,bstr,www.mirc.com)

Making the bstr by reference does not make a difference.

Documentation about the url method: here

EDIT: first time I use mIRC in a few months and already forget there is a newer version. Though it doesn't crash anymore, it does spit out an error I've never encountered before.