Photoshop Extended has the ability to open video clips but it is to allow the user to manipulate the image in each frame, a process known as "rotoscoping" ('roto' for short), or for creating animation. It is NOT intended for editing as it only works on one clip at a time.
Premiere Pro is the video editing app by Adobe that works well with Photoshop, but you can also use any number of editing apps on Windows or Mac.