Chinese QQ QZone’s photo image display javascript gets in the way of saving large images
On Chinese QQ QZone people have walls similar to FB. QZone uses an image display script in your browser. If the image is large when you right click and you can save the image as .PSB or .JPG, but it will not render in your browser, as .PSB is an unknown file type. I believe QQ’s javascript manipulated the image so you can zoom and move around, but this gets in the way if you want to see the original pic and zoom for yourself.