by Cris Fuhrman.
I am using "restrict access" features on the assignment, and the hyperlink is not so great, as students can download.
My workaround, which I find inconvenient, is to create another activity (containing the file the students need) and make the same access restrictions.
Indeed it would be good to have assignments with file attachments, so access (and configuration) was all controlled from one place. It seems like a frequent use-case, given the amount of responses in this thread!