Why does this file count always return 0?

         DirectoryInfo dir = new DirectoryInfo(Application.persistentDataPath + "/MageRunner");
         DirectoryInfo[] files = dir.GetDirectories("*.*");
         int x = 0;
         for (int i = 0; i < files.Length; i++)
         {
             if (files[i].Extension.Equals(".pd", StringComparison.OrdinalIgnoreCase))
             {
                 i++;
                 x++;
             }
         }
         Debug.Log("Player File(s) found: " + x);

As the question says... x is always debugging as zero, even though I have a file at the specified path. I know the filePath is correct as it is the same path I used to save the file in the first place.