Why can't I convert these photos?

I took pictures off an Iphone. Tried to open them on my Windows 8 laptop. I can download them, but when I open the pictures, it tells me the file type is not supported. So I tried two different online converters. Both of them said that an error had occurred each time. I tried converting the files to BMP, TIFF, GIF, and JPEG.

Maybe the process you copied for taking the pictures off the iPhone was flawed. What did you do to copy them off?

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