HI,
I have experienced in developing .Net based to to get data from web including API.
I did had a look at the wikimapia api and have understood their structure.
Addition to this, I know the structure of KML files and generate using .Net with different color for marks if you like.
I will also provide a installer, which will auto handle the requirements of dependency and in a friendly way and silently install components.
Lets discuss in more detail of your requirements, how how you will use the tool and what info you like to capture.
Thanks