yah, the 'problem' is in /scripts/download.inc.php
there is an if / else at the bottom causing the different behavior for different scenarios..
i'd need more access to determine what to do with $file and $file_orig..
or tell your IT guy to play around with that 1st if..
make it if (1) and see what happens.. then if (0) and see.. the 'failures' will give me the info i'd need to suggest a 'fix'