Why is attachment not opening in Outlook?
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One of the most common causes of this problem is because the file extension isn't supported on your PC. This is caused by the fact that the Outlook Web App blocks file extensions that aren't supported by your computer. The most common solution is to clean your temporary files. Another simple solution is to use Save as an option. If these methods don't work, you should look into using advanced tools to fix the Outlook attachment problem.
See also - https://emailspedia.com/unable-to-open-outlook-attachments/
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Referenced by
elianairis
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Unrecognized file format
One of the most common reasons why you can't open an e-mail attachment is because your computer doesn't have the necessary program installed to recognize the file format.
Hope This Helps,
Peter