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The lack of file extension in the download file is a problem in the software you used to download it. If it was a browser, sometimes you can change the default settings and it helps. Otherwise, you have to set the file extension when you save the file. I bet the file extension was correct in the actual email, but the saving part just was messed up. I used to see this downloading some files in Windows, also, if it was a file extension Windows did not know about. Not Amazon's fault.
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