Q: How do I connect iPhone 6s via bluetooth to windows 7. Purpose: reproduce of music on the netbook.

Hi Sergio,

I understand that you would like to connect your iPhone to your Windows computer through Bluetooth. That is something that you will not be able to do. The connection to play music is going to be through supported headsets or speakers. Take a look at the link below for more details on the supported profiles for Bluetooth on your iPhone. 

iOS: Supported Bluetooth profiles
https://support.apple.com/en-us/HT204387

Have a good day