Is it possible to change the icons of games (Fortnite, Valorant, CsGo)?

Is it somehow possible to change the icon for such games with a self-made one? Whenever I try this, the file path is shown to me and it says this path contains no symbols.

This is also the case when I try to change the icon for folders with my own.

Google is like God. At least as far as knowledge is concerned.