Ethics and professional skills module - Peer assessment

Hi everyone, I am taking the ethics and professional skilled module, and I'm in unit 8. I have already submitted my presentation and am doing the peer assessment. However, when I download the "GetAssessmentAttachment" file to review, I can't open the file. It seems that my computer can't open the file, and I have no clue about the extension of the file. Please give me advice. Thank you!