IconChanger can change the icon of a separate file regardless of its type. If you have hundreds of mp3 or doc files, you can change icons of your favorite files to emphasize them. Right click on a file whose icon you want to change and select Change Icon. Explorer-like interface helps you to find and select an icon for the file or for all files of the same type. You can drag favorite icons to a list and have easy access to them later.
Limitations: The evaluation version of IconChanger can change no more than 3 icons and is limited to finding a maximum of 3000 icons.