Heres a solution.
Step 1: Install mplayer from extras-devel (warning - do a *lot* of reading before you enable the extras-devel repository, it can be dangerous for your n900 if you mistakenly install the wrong package. immediately disable extras-devel once you have mplayer installed.)

Step 2: go to X terminal, and type this:
They are obviously using a very non-standard codec which looks like it requires some activex component, stupidly. But faithful mplayer plays it regardless!

Good luck.