- Go to your library
- Click "Add a Game", then "Add a Non-Steam Game..." and then "Browse..."
- Browse to the root of your cracked game and select the .exe
- Go to https://steamdb.info/ and search for the cracked game you're trying to style
- Select and copy the game description
- Enter Steam, go to the page of your cracked game
- Click "New Note", paste in the description and click "Save and Close"
- Return to SteamDB, go to "App info", and go down to "Assets"
- Now right click, and "Save linked content as..." for the "clienticon", "clienttga" and all of the "library_assets" (you can save the "library_assets" wherever and delete them after, you need to keep the "clienticon", and the "clienttga" tough)