For future reference it's cause it's the wrong file type. When you save it on your computer, select "Save as". Below the File name box there should be a box saying somehing like "Save as type:" with a dropdown list. Open this and select the type you want, eg. GIF, JPG, or PNG.
GIF is usually largest but best for working with. I recommend converting to PNG when you've finished cause it has a small file size and good quality.
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