You'll need to do hacking with your explorer.exe

try Resedit.

I've attached the modified shell32.dll to make this operation easy if you want to try it:

1. Replace your c:\windows\system32\shell32.dll using Replacer with the attached one (remember to backup your original)
2. Reboot
3. Rebuild Icon Cache (with TweakUI or Folder2Ico)
4. Disable caching of thumbnails (Folder Options->View files->Do not cache thumbnails)

I've also included the shell32.ico if you think it's safer to ResHack shell32.dll yourself, otherwise, you don't really need it.