[tcbusch]

The radar images that you can select, in the settings for the city you are editing, are located in the radar.txt file. If the radar image you want to add is not in the radar.txt file you can enter it manually, which you already know because that is what you did. When you save the image or click ok the image url, name, order, purge minutes, and update minutes are stored in the registry.

HKCU/Software/Marsware/WeatherPanel/Cities/<name of your city>/Radar/<name of your radar map>

One of the values is called URL.

I would recommend exporting the HKCU/Software/Marsware/WeatherPanel/ key to a file then copying that from one phone to the other and import.