.EF File Extension
What is an EF file?
Exam file used by Wimba Diploma, an application used to create exams; contains custom questions, instructions, answers, chapters, editing marks, and test layout information; can be exported as an .RTF file for convenient sharing.
To create an EF file, select File → New Exam and create your questions. Then, select File → Save, or click the "Save" icon, name the file, choose the save location, and click Save.
NOTE: When Wimba was purchased by Blackboard in 2010, development of Diploma ceased.