openNI configuration

hi guys
i am w/beta 30.2 and Xtion pro live .
all nodes are working, but i get 320x240 for RGB&Depth only (info.DX9)
editing of neither C:\Program Files (x86)\PrimeSense\Sensor\Data\GlobalDefaults.ini
nor C:\Program Files (x86)\OpenNI\Data\SamplesConfig.xml
does not show any effects.
can someone point me how to set the configuration file?
edit: i think info.DX9 is not correct, cause the pic quality looks same as VGA in NiViewer