Microsoft has added many features in Windows Vista and Windows 7 but unfortunately has removed from the folder options menu, the well known File Types tab. With its help, you were able to view and also change the file extension icon under Windows 7.
This is why a custom application called simply Types was created for Windows Vista and Windows 7. With Types you can view and modify the file extension icon the same way you were able to do in Windows XP. When you run Types, it will show you what the current file extensions on… Continue to Use Types to change file extension icon in Windows 7