Just to say, you could always have gotten a png image on your comp (even go to paint, mess about, save as png, go to where ever you saved the png, right click it and choose properties. where it says open with, click change (which is next to it), choose paint, click ok and then click apply
then it would be sorted, sounds like alot but can be done as quick as 1 2 3 :)
A wise man once said to me, "life is hard, but it's harder if you're stupid" - Duthos
Just for future reference, right clicking on a file, choosing "Open with...", and then selecting "Always use the selected program to open this kind of file" is a shortcut to the first solution and likely what Stuart was alluding to.