XnView shell extension allows for viewing a thumbnail of the selected image in the context menu of Windows Explorer. You will be able to convert, resize or rotate easily. You can use it to change your wallpaper, or even edit IPTC metadata.
XnView Shell Extension is small, support many languages, can be used with XnView, 500 formats supported, IPTC editing, send to wallpaper It supports all windows version
All users that use windows explorer to view their picture files. They can easiky view thumbnails of picture.