Nokia X Launcher Icons

Hi, I was wondering if anyone has looked into the stock launcher apk. The thing is that is contains icons for many third party apps like whatsapp, facebook, instagram, etc. that are not used. For example the launcher automatically uses his own icons on certain stock apps such as phone, sms, etc. but it also uses them for third party nokia partner apps such as HERE Maps, you can tell those apps are treated differently by the launcher since you can't change the color of the app.

So my main question is, is it possible by any chance to decompile the app and see what would it take for the launcher to show the right icons for third party apps?

Thanks

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