...
1.) Go to the Grade Center and click in the cell of the assignment you want to grade, and select "Attempt xx/xx/xxxx," where xx/xx/xxxx is the date the assignment was submitted:
2.) The Grade Assignment window opens:
(Note: these file types are supported: Microsoft® Word (DOC, DOCX); Microsoft® PowerPoint® (PPT, PPTX); Microsoft® Excel® (XLS, XLSX); PDF.)
...