I think I was able to make it work!
I changed all #if WINDOWS_STOREAPP to #if NETFX_CORE and commented some code on SkeletonBinary.cs (BufferedStream seems to not exists on Windows Store)
/*
using (var input = new BufferedStream(await folder.GetFileAsync(path).AsTask().ConfigureAwait(false))) {
SkeletonData skeletonData = ReadSkeletonData(input);
skeletonData.Name = Path.GetFileNameWithoutExtension(path);
return skeletonData;
}
*/
return null;
Not the recommended fix, but now I can compile! I will test the final result and report if it worked.