ImageXtender is a unique free application that teaches your Windows XP image viewer to understand more than 200 image formats, including some really rare and old ones. Also, ImageXtender allows viewing nonstandard formats produced by digital cameras or mobile phones. ImageXtender builds itself into your operating system. Once it is installed, you can view images of most formats in 3 standard Windows modes - Preview, Thumbnails and Filmstrip.

Screenshot of ImageXtender