Open IE: Tools |Internet Options |General tab |Select the Delete Files
button. Try again.
If that doesn't work, have a look at this link:
Internet Explorer Does Not Save Graphics Files in the Proper Format
http://support.microsoft.com/support/kb/articles/Q260/6/50.ASP
> Since a short time I only can save images from the internet in bmp format!
> Does someone knows how to change it?
> Thanks
> Anita