Try to create a folder in Windows with name of these names–

CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9 can be more too. All are Windows reserved device names from the early days of DOS. So windows will not let u create.

But you can create it using a simple trick.

1. Rename folder from the right click option.
2. Now press alt and press 255. (press 255 from the right side of the key board i.e., num pad- where only numbers are given)
3. Now type con and then press Enter.
You will see a con folder created in your pc

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