From Information about Isaak, Brock University's Sakai-Based LMS
DOCX is the file format for Microsoft's XML based MS Word Document format.
 Can't open DOCX
If you have a copy of Office 2007 and you've been told that nobody can open the files you are creating try opening the file again and choose "Save As" from the office logo at the top right and save the file again but change the format option to office 97/2002/XP.
If you have received a DOCX and need to open, please review the options below.