Context ThumbView is a Windows Explorer context menu extension that provides image preview directly in the right-click menu. It supports most of popular image file formats, including BMP, GIF, JPEG, PNG, TIFF and is very handy for quick image viewing. Context ThumbView is brought up by right-clicking on an image file in Windows Explorer. It allows to save thumbnails, send them by email or copy to the Clipboard. Thumbnail dimensions and additional displaying options can be configured using its Configuration Manager.
Add items to Explorer Context Menu - Easily
Add items to Explorer Shell Context Menu (C#)
Add items to Windows Explorer Context Menu
Fast Explorer Context Menu Extension DLL 220.127.116.11
Context menu extension library
Add Items to Windows Explorer context menu