You are probably correct that there is a short but when you say it is melted do you mean it is blown or is the plastic part melting as well? If it is actually melting then the fuse is too large for that circuit and it is allowing it to get too hot before it blows the fuse.
However, if the fuse is just blowing then we need to find out what is causing it to blow when you operate a window or some other component on the circuit.
Unfortunately we don't have a wiring diagram on this vehicle as it is not offered here in the USA but if you are able to look in your owners manual and see what is on this fuse other then the power windows then we need to start going through these components and operate them until the fuse blows to see which one is doing it.
Once we know that, we can narrow it down to a switch, motor, or ground issue.
If the fuse blows on its own then you have a wire that is most likely shorted to a power wire that is putting too much voltage through the circuit.
Let me know what questions you have and we will try to walk through this even through we don't have a diagram.
Friday, January 15th, 2021 AT 5:43 PM