Does somebody knows, where Mplayer looks for fontconfig file by default?

In folder /etc/fonts I have: 
conf.avail (folder)
conf.d (folder)
fonts.conf (file)
fonts.dtd (file)

When I using Mplayer with -fontconfig -font "font", it cannot find fonts.conf 
file. So my questions is where on default Mplayer searching for fonts.conf file 
to put it to.

I have already tried to put folders in:

Mplayer/etc/fonts/fonts.conf
Mplayer/mplayer/etc/fonts/fonts.conf
Documents and settings/Username/etc/fonts/fonts.conf,
but it still not found.

So I don't understand where /etc/fonts/* folders must be.

When I added FONTCONFIG-FILE="path" to my environment variable, it is working 
and fonts.conf loading saccesfully, but there must be default path, where 
Mplayer looking for fonts.conf to not adding new parameter to environment 
variable, as it would be much better and simplier.
Thanks.