hamachi.ini is used and managed by Hamachi. This in particular means that any changes made to this file while Hamachi is running are ignored and written over.

To add custom settings such as RoutedTunneling, BindTo or TxRate or to override default ones hamachi-override.ini file should be used.

When Hamachi starts, it first reads hamachi.ini and immediately after this it loads hamachi-override.ini. Any settings found in latter override any values loaded from former. Hence the name.

Lastly, Hamachi never modifies hamachi-override.ini file.