Thats not what I see.
In Driver mode I see that the top level (non child) windows is captioned:
"CoPilot 2003" and is actually a dialog frame. The styles are:
This is a container window only, the main panel has a caption of:
"In-Vehicle Route Guidance"
which contains two windows: PanelMap and PanelGPSTop
I have been able to get windows to embed by getting the caption correct and the window suporting resize.
Without the author of MediaCar the only knowledge I have been able to get is empirical. By making my own things embedd. This have been pretty easy, but I haven't started on co-Pilot yet. I first need to figure out why it hangs sometimes when I click the itinary, and why it tells me to turn left and yet the map clearly shows right sometimes. I have 2003 with the latest patch. Im impressed with the quality of the program except these important errors in makes (and the very annoying hangs). at least its better than Desinator which didnt even have my town on!
Please let me know how this goes. If you dont figure it out, I'll write a wrapper program that launches and finds the CoPilot windows and tells it to resize. If it wont listen, then its possible to change the window styles for a window too, you need the processid which can be found by enumerating the process table.