Hi gr3en,
I think you may ask Google to see if they have a existing API for you to work with Windows Store App. As I know Google Map API v3 should help you implement google map functionality on Windows Store App by HTML and JavaScript.
However if you load the map into a iframe or x-ms-webview is also a possible solution, I found a similar discussion:
http://stackoverflow.com/questions/23520879/integrating-google-maps-into-winjs
--James
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