[racket] [scribble] hyperlink bug?

Hi,

In the OOPLAI source, I link to an external file using an absolute address as follows:
@hyperlink{"http://www.dcc.uchile.cl/etanter/defmac.rkt"  @scheme[defmac]}

In the generated page (*), the link works correctly under Safari, but fails under Firefox and Chrome. In these browsers, clicking on the link goes to:
"http://www.dcc.uchile.cl/~etanter/ooplai/%22http://www.dcc.uchile.cl/etanter/defmac.rkt%22"

which of course does not work.

Strange, isn't it? 

-- Éric

(*) see http://www.dcc.uchile.cl/~etanter/ooplai/From_Functions_to_Simple_Objects.html
the first margin note