Change File Type Icon in Thumbnail Preview

I use Google SketchUp a lot and each new model/file I create, SketchUp makes a .skb back up file of the last save. I was able to create a subkey in the registry to associate a different icon file for the .skb files but it does not change the icon if the folder view is set to medium, large, or extra large icons and gives a thumbnail preview of the file contents.

Examples of the same files in the same folder below.



Notice how in the thumbnail preview all the file type icons are red and in the detailed list view the .skb file icons are black and the regular .skp files are red, like I want them.

In this particular folder it does not matter, just an example. But when navigating through other folders that contain many image files as well as the .skb & .skp files it can be confusing to tell which is which and I don't want to edit the wrong one. The thumbnail preview can be very helpful so I am trying to avoid changing the folder views.

If anyone has an idea of how to change that icon in the thumbnail view it would save me a lot of time and confusion, thanks in advance.