A good question, this is because Microsoft has a bug or intentionally created this 'bug' in their Microsoft windows (all versions). Practically you canâ€@trade;t name it 'con' whatever you try to do. For the more advanced users 'con' is reserved for a function from the ancient Dos, Console. For example 'copy con test.txt' entered in dos will leave the cursor blinking and thatâ€@trade;s it.