If they are defaults, there is no file to edit yet, you'd have to create one. Otherwise search for a gtkrc file somewhere on your system (if you have /usr/local/share/themes and it's populated with themes you'll have lots of them in there but they won't likely be the one that's in use)
See if there's already a .gtkrc-2.0 file in your home dir. I've not had ROX file manager, possible it's customized your environment?
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