I stumbled across this one on the Microsoft Download site when looking for something else altogether. It’s the Microsoft Camera Codec Pack and it’s a piece of software that once installed will allow you to use native Windows to view a wider range of images than before. I will also allow you to view RAW format photos that many cameras produce. I’ve tried this with my Canon 650D and it can easily display some of those RAW format photos I took of the Grand Canyon last year.
You can download the Microsoft Camera Codec Pack here