Someone reported (thanks!) that a download link for a torrent was not working properly (torrent: link).
I already suspected at first that there might be a strange character in there, but all characters work fine on Windows and are accepted as valid (including the semicolon). After a bit of checking it turns out the problematic browser is IE7. It cuts the filename at the semicolon. After checking the code again I understand why it could possibly, remotely, happen granted that the developers for IE7 are a bunch of tards and are keen on ignoring common sense and anything that requires brain cells.