Text becomes unreadable Squares

Text becomes unreadable
  1. Open Notepad
  2. On the very first line, type in "dont eat the donut" (without quotes) then save and close the file. Note: the file should have only one line of the text above.
  3. Now, open the same file. You'll notice the text becomes unreadable squares. (try this with different text with the same format and length).