SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats directly in Windows Explorer by using Pierre-e Gougelet's GFL library (XnView's author).
Please read carefully the following information:
As SageThumbs is a Windows Explorer context menu extension, there is no an executable file that you should launch to bring it up. To use it, just open any folder with image files in Windows Explorer, and then right-click a file you want to preview. You'll see the thumbnail immediately in the context menu.
* Windows XP/2003/Vista/2008/7/2012/8/8.1 32/64-bit * About 5 Mb of disk space + additional space for cache