I have a fairly substantial library of pictures that I have built up over some years. These are either digital camera pix or scanned images, all of them having been through Photoshop and saved as JPEGS. I have recently discovered that without exception, they have all now turned into "Quick Time" pictures. Firstly, what are Quick Time pictures, secondly, why has this happened, and finally, how can I convert them back into JPEGS? I'm totally baffled!
Try right-clicking on one of the pics and then choose Open With ... and you should be able to open them with whatever program you normally use to view the pics - also set it as the default open program.