This is probably in other threads but I cant seem to find out what I need

When I go to Manage POIs from the menu and change ICON it offers me 3 screens of Icons to choose from which comes from the branding.zip ui_igo8_da\common\poi_mapclose.bmp, that much I have worked out

But how do I use other icon that I have in the ui_igo8_da\common\ directory, there are hundreds of them

How do I associate these with the POI, is it possible?