I concurr with CWI555 regarding the changing of it's image file format.
If you go to cnet.com, you can find a variety of image viewers and most of them now give you the capability to change the image file format just like Gerald suggested...
The one application I use is called "Fastone Image viewer", the version I use is "freeware" although this particular version has no limitations due to it's status as "freeware". An excellent and very user friendly program app IMHO. :)
Respectfully,
Henry