It is possible to make it so that when running the server on this address to display the html page located somewhere on my computer?
No. That the client received the page, the server should give it back. To do this he must listen to the standard port to wait for the request to him.
But. You can put-choose to create another server that will weigh in the tens or even hundreds of times less than the monster OpenServer, which is a processor for developing in PHP + MySQL + ... , and this "little" to put on autostart at system startup, for example.
However in this case, when running the OpenServer he swore to you that someone has already occupied its port.