The <prohibitedfiles> element defines file types that course participants (students,
teachers, teaching assistants, etc.) are prohibited
from uploading into assignment dropboxes, grading screens, announcements, and discussion forums.
This setting does not
restrict course author uploads.
|prohibitedfiles||extensions||A comma-separated list of prohibited file extensions. Do not include
the period for the extensions. For example, this is a valid value: mov,mp4,mp2,avi,m2v,d2v,d3v,dv,dvx,f4v|