Right-click and select "Save As...", and then you should be able to play the file in a web browser window (assuming you have Flash installed).

The low-res trailer (7.8 MB):
http://wwws.warnerbros.fr/movies/unl...s/ld_ba_lt.swf

The high-res trailer (13.1 MB):
http://wwws.warnerbros.fr/movies/unl...s/ld_ba_hi.swf