http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2015/06/17/Why-am-I-leaving-the-Windows-Phone-platform-for-good-today.html
So this made it clear that Windows on phones has nothing in common with Windows on PCs, where you can develop any app you want, performing any task you want, the concept of private APIs does not exist, whereas on Windows Phone, the OS as tightly locked as an iPhone, and there is no possibility of jailbreaking it (I say this because W10, due in the next 4-5 months, will surely made the current interop unlock method obsolete).