public static string[] GetUselessFiles(IEnumerable <string> filePaths)
{
var selectObjects = filePaths
.Where(f => !UnityApi.IsSceneFile(f))
.Where(File.Exists)
.Select(AssetDatabase.LoadAssetAtPath <Object>)
.ToArray();
return(selectObjects
.Where(obj => !Tracker.FindReferences(obj).Any())
.Select(AssetDatabase.GetAssetPath)
.OrderBy(f => f)
.ToArray());
}