by Joshua Bragg.
Do you mean saved without an extension on their computer or saved without an extension using the Save As box in the upload dialog?
The answer to the first question is no. As far as the second one I'll have to consult with the students.
I'm guessing you think this might be related to MDL-33391? I saw that before but I'm running on Linux. In any case I'll report back when I hear from my students.