Ok I'm now able to view it after installing the firefox 3.5 beta version. I also found this bit of info that could be used as a reference.
"WMP plugin is hard-coded to only play the proprietary Microsoft formats (.asf, .asx, .wm, .wma, .wax, .wmv, and .wvx), and Windows Media Player provides no provision for changing this. For the most common formats found on the web (like mp3, midi, mpg, wav, etc.) you will need to install and configure Quicktime or Quicktime Alternative."
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