Universal Windows Platform: WinRT API in C# scripts

It is possible to use WinRT API directly in Unity scripts. However there are limitations and requirements for this:

Scripts must be written in C#, it’s not possible to use WinRT API from UnityScript
Scripts must be compiled using Microsoft’s compiler, not Mono. This requires to set compilation overrides to Use .NET Core or Use .NET Core Partially, in the later case scripts must not be under Plugins or Standard Assets folders
Because the same script code is also used by Unity Editor (which always uses Mono), all code that uses WinRT API must be under ENABLE_WINMD_SUPPORT define

Below is an example for getting advertising using WinRT API directly:

using UnityEngine;
public class WinRTAPI : MonoBehaviour {
    void Update() {
        auto adId = GetAdvertisingId();
        // ...
    }

    string GetAdvertisingId() {
        #if ENABLE_WINMD_SUPPORT
            return Windows.System.UserProfile.AdvertisingManager.AdvertisingId;
        #else
            return "";
        #endif
    }
}

Note: when using IL2CPP scripting backend, this is only supported when using .NET 4.6 compatiblity profile.

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AppCallbacks class

Universal Windows Platform Player Settings

Unity Manual

Universal Windows Platform: WinRT API in C# scripts