JSI Tip 5750. Windows XP SP1 cannot view some Web content in thumbnail view?

Microsoft has caused SP1 to disable the ability to view thumbnails on the following file types:

HTML documents             (.htm and .html files)
XML documents              (.xml files)
Internet e-mail messages   (.eml files)
Internet news messages     (.nws files)

Microsoft reports that this change was make to improve stability and performance.

NOTE: See tip 4132 » How do I arrange files using folder views in Windows XP?