Description of the problem in the MSDN:

"To specify a COM port number greater than 9, use the following syntax: "\\.\COM10".

This syntax works for all port numbers and hardware that allows COM port

numbers to

be specified."

But there is not quite right :) They write "\\.\COM10" it's not going to work.

Correctly so: "\\\\.\\COM10"

I tested on Win7x32, COM > 9. Work correctly.

Added fixes to the drop-down list of ports.

In the name of the port removing unnecessary characters for the user's convenience.