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Please remove the XNA stuff and update the library to target .net core (UWP).
This is unusable for Windows store apps as it is. I'm going to look at the source to see if i can do something with it. Hopefully i can just build a new solution. But we'll see. UWP uses .NET core instead of .NET framework.
XNA ?? Why use something so old, no one uses XNA anymore. There's only so many times i can reinstall something that I'm never going to use. Look at building a SharpDX sample.