I am trying to get a video to launch from one of my websites. It works just fine opening from a mac but not on a pc. I'm very new to using video, and I can't figure out what is wrong.

the test webpage is:

And the link is:
Click here for an 8 minute VIDEO of the Boston Minstrels.

On a PC, the Real Player window opens up, but it behaves as if it can't find the video. I know there are different extensions for real player, like .ram, .rm and so forth, but I don't understand the purpose of that.

Can anyone advise? Thanks! Any help is very appreciated.