How do I change the default icon of a .asset file ?

Hi guys,
How do I change the icon of a .asset file to whatever I want it to be .
I would just like to change the icon from being the default unity icon
54348-z.jpg

Unity can’t do this. This is set up by the OS, such as Windows. A file extension has an associated icon, this can be changed through the registry. By default the icon is whatever is used to open that file, in this case, Unity. Text files have a notepad icon, because the default program to open text is Notepad.

https://msdn.microsoft.com/en-us/library/windows/desktop/hh127427%28v=vs.85%29.aspx