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I received an email with a PDF Document which I can not open.
Sorry for the delay in response.
As per the screenshot , it seems the file you are trying to open is not a valid pdf file. (.pages in the end of the filename).
Also, it seems you are not using Adobe application - Adobe Reader or Adobe Acrobat to open pdf files. You may request the sender to send you the file again and try again.
Let us know if you need any further help.