text being converted to HTML on upload

[bmansc]

I'm using FireFox 2 and DownThemAll 0.9.9.7, and have had no trouble until recently. I use Moodle for a classroom management system, where students upload assignments. My students upload .txt and .java files, but now all of a sudden, when I download those files, either with DownThemAll, or by right-clicking, html tags are being added to the .txt and .java files, and an .html extension is being added. The extension is not a problem, but it is actually changing the content of the file. I'm not having the problem if I download the file with Internet Explorer, so I know the files are being uploaded correctly.

Any ideas?

TIA,
bmanSC