I'm not sure if this is the right place, but it seems like my best bet.
I want to change the icon assosiated with files, the same way you are able to change the icon of a folder or shortcut. I am not trying to change the icon assosiated with a type of file, but an individual file.
For example, I have music from artist A and artist B, they are the same filetype (.wmp) but I want to set a different icon for artist A and artist B.
Is there a way to do that? Preferably something I can change on my computer, but external software works too.
To the best of my knowledge there is no way that you can associate an entire file-type that way. You can certainly change the icon associated with a file-type like .wmp by changing the default controlling software, but it would be the same for all files of that type system-wide.