With Windows Explorer look for the name of that POI in the map folder (North_America, or the like [ the folder, not the name of the POI]) there should also be a .bmp witht he same name.
Pick one, save one or make your own icon with a size of 22 x 22 pixels. Name it the same as the one you want to replace, then copy it to the map folder. When the alert comes up that there is a file of that name select overwrite.
You should now have your new icon popping up for that POI's location.
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