Intead of the file icon the application icon appears

Jaoao, Hello.
It means that it has changed from an icon that looks like a SIM card on a mobile phone.

There is a possibility that the Windows registry has been rewritten in some way and the icon association has changed.
The quickest way is to reinstall.
(There is a way to edit the registry yourself, but it is not recommended because it involves the risk that Windows itself will not start)