No more than two/three days ago, the icon for the File app (file manager) is no longer shown, and the icon with the wheen is shown.
Can I recover the correct icon, someway?
It looks like the icon name in the file
/usr/share/applications/io.elementary.files.desktop has been translated in some locales for some reason. If you are in a locale where the translation has changed the icon name (at present [ca] and [it]) then it will cause this problem.
I will file an issue against the project.
You could use the AppEditor app from the AppCenter.
AppEditor search for your app click the icon and choose from available icons. See if that works.
It's a translation error, as Jeremy said. To fix it, edit the file
/usr/share/applications/io.elementary.files.desktop as sudo (e.g.
sudo nano /usr/share/applications/io.elementary.files.desktop in the terminal). Look for the line that says
Icon[it]=gestore-di-file-di-sistema and replace it with
I had the same problem in Catalan and this fixed it. Hope it helps!