How do you change the icon for different formats?

[l Xes l]

I just installed the alienware GUI stuff which i like for the looking of menu and bars..
however i dislike some of their icons... is there way to change the icons for different formats such as zip, jpg, gif, doc..?..

 

[n0cmonkey]

Maybe in folder options -> file type?

 

[l Xes l]

thx!