mc, browser and special characters

[andras.lorincz@gmail.com]

I want to open html files from within mc by pressing enter on them. But I 
cannot open files that have spaces in their names. In mc.ext for html files 
is:

regex/\.([Hh]tml?|HTML?)$
        Open=firefox file://%d/%p & >/dev/null 2>&1
        #Open=run-mailcap text/html:%f
        #Open=if test -n "gnome-moz-remote" && test -n "$DISPLAY"; then 
(gnome-moz-remote file://%d/%p &) >/de
v/null 2>&1; else links %f 2>/dev/null || lynx -force_html %f; fi
        #View=%view{ascii} lynx -dump -force_html %f

I tryied to put 

Open=firefox file://"%d/%p" & >/dev/null 2>&1

and 

Open=firefox file://'%d/%p' & >/dev/null 2>&1

but no result. How should I change it?