Images made in Xpro5 are different dimension in XWD7

Is this a bug or a feature? The width of the png exported from Xtreme Pro 5 is 760px in width and the same in the file folder on my hard drive. When I import it into XWD7 it becomes 500px. The width/height ratio is OK so I can enlarge the image but what is controlling/changing the image dimensions in XWD7?

feature

in photo designer and designer pro you can turn it off in options, not sure about web designer - the presumption is [I think] that for web most images will not need to be any wider