AssetTypeCheckerWindow.cs

using UnityEngine;
using UnityEditor;

public class AssetTypeCheckerWindow : EditorWindow
{
	Object obj;
	string msg;

	[MenuItem("Window/AssetType Checker")]
	static void Init()
	{
		var window = GetWindow<AssetTypeCheckerWindow>(true, "AssetType Checker", true);
		window.Show();
	}

	public void OnGUI()
	{
		EditorGUI.BeginDisabledGroup(true);
		EditorGUILayout.ObjectField("Script", MonoScript.FromScriptableObject(this), typeof(MonoScript), false);
		EditorGUI.EndDisabledGroup();
		
		var newobj = EditorGUILayout.ObjectField("Drop Here", obj, typeof(Object), true, GUILayout.Height(30f));

		if (newobj != obj)
		{
			obj = newobj;
			msg = newobj != null ? "Type = <b>" + newobj.GetType() + "</b>\nPath = " + AssetDatabase.GetAssetPath(newobj) + "" : "";
		}

		var boxStyle = GUI.skin.GetStyle("HelpBox");
		boxStyle.richText = true;
		boxStyle.fontSize = 12;
		EditorGUILayout.TextArea(msg, boxStyle);
		EditorGUILayout.Space();
	}
}