Card maker is not working

[yy4u]

The card maker on this site doesn't seem to be saving properly. when I try to save as .PNG it saves, but as a 'file', no extention. I can open it in ms paint but thats about it. Only one of the cards that I have made seems to have saved as a .PNG. Never had this problem before.

[Scaredgirl]

Here's a crazy idea: save it as a .PNG file and it works fine. So instead of saving it as "card", save it as "card.png".