The ability to view TC Drawing Thumbnails in Windows Explorer, can be very handy. I came across this site, that works through how to resolve the thumbnail function in Vista. Follow the directions to set up the 32-bit Windows Explorer shortcut.
My own Vista 64-bit thumbnails worked only when they felt like and not when I would have liked to use them. Just open the 32-bit W-E, use the extra large icons, and you will be able to preview all your files. DH
John, You always have the best questions!