When an instructor assigned a file upload type of assignment with the peer review feature turned on, Microsoft word documents do not seem to be previewing for the students who are completing the peer review. It forces them to click on it and download instead of previewing the window like it does for instructors in the Speedgrader.
If the instructure uses a website URL and has students submit the sharing link for a Google doc, it previews in the peer review screen for the peer reviewer.
Is this consistent with your experience when using peer review? I wish the Word document would automatically preview for students. It makes it quite difficult for them to do a real peer review in my opinion.