Originally Posted by PURDooM
Theres alot of values you might have to mess with in the hex to get larger than 32x32 icons.
If it were me trying to solve the problem, I would write a program to read the image of the map and attempt to indentify what is / where is the poi icons. Perhaps its also possible to get the physical screencoordinates of where they are drawing too if one could indentify what function is called in memory to draw a POI icon (because it would only be logical at some point there is a master 'drawpoiicon' function.
Once you have the coordinates of where the icons should be, its trivial to make a program to put your own icons in place.