We are having a problem when we download WinZip files from moodle site. Students can upload zipped files using WinZip onto moodle which is fine, but after we try to open a zip file from moodle site, we get the following message:
"Cannot open file: it does not appear to be a valid archive.
If you downloaded this file, try downloading the file again. "
In fact, the files are Ok before we upload them onto moodle. Is there any solution?