private void CheckProjectFileName (ProjectFile file)
 {
     ClearOwnFileErrors (file.FilePath);
     if (file.IsResource ()) {
         if (file.FilePath.FileName.Split ('.').Last ().ToLowerInvariant () == "axml") {
             TaskService.Errors.Add (new Task (file.FilePath, "Layout file has axml extension", 0, 0, TaskSeverity.Warning, TaskPriority.Normal, null, this));
         }
         if (file.FilePath.FileName.Any (Char.IsUpper)) {
             TaskService.Errors.Add (new Task (file.FilePath, "Resource file has captial letter in filename", 0, 0, TaskSeverity.Warning, TaskPriority.Normal, null, this));
         }
     }
 }