if you are using Firefox you might have this difficulty when saving image files
Firefox will try to save images as “url.htm”
There are two ways to fix this,
1. you could just drag the image from your browser to your desktop, you may want to change the name after that since it will save the image as url.jpg
2. You could run Firefox in safe mode,which has been reported to fix the problem, but it’s no permanent fix as there is no add-ons in Safe mode.
Alternatively, you could use other browsers like Opera or Chromium