i remember you talking about navigator before, i have no idea what it looks like or any info about it. Basicly all you should need is the window title and path and it should embed, but thats assumeing it works like any other normal windows app, but we all know there are hard to embed apps. Other than that, i cant really help much as i know absolutely nothing about this app.
As for the weather, weather in RR has little to nothing to do with MCE My Weather plugin (crap IMO, but thats another topic). You set the location of weather in RR.ini file located in the root install of RoadRunner
add these two lines to the bottom of the file (if you dont allready have them)
On another note, (@RR devs) can we please have the weather config inside of RRConfig.exe so people can stop asking where to config it? I think it has to be the most asked question, im not sure why the answer is so hard to find, its out there in multiple threads.