What photo files are compatible with Windows 8?

I took pictures on my uncles Iphone and tried downloading and opening them on my windows 8 laptop. I can download them, but the file type does not seem to be compatible with windows. I can convert the photos to a different file type but which file types are compatible with windows?

I'm using Windows 8 and I think using the following formats would be fine:
.JPEG, .PNG, .GIF

Try XnView. It's free & supports more than 500 image file formats.
http://www.xnview.com/en/index.html

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