Can't change lc_numeric value

["Eduardo Ferreira" <eduardo.edusantos@xxxxxxxxx>]

I'm using postgresql 8.2.4 for Windows in my server. I'm trying to set lc_numeric value to pt_BR, and it tells me it's invalid for this variable. If I try do to the same for the en_US locale, the operation is completed. So, my question is: isn't pt_BR locale supported for Windows? Is there anything I can do to solve it?