rxvt-unicode iconfile setting

[vinurs]

Hi,
    In .Xdefaults, i set iconfile using the following:
         URxvt.iconFile: /home/vinurs/rxvt-unicode.xpm
   using xrdb .Xdefaults,    but, it can not go into effect !
   I'm using fedora 16, is there anything that shoud set?
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