A Little Video Help Please

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Trying to understand something here.  All the video I've seen or posted
before has been .wmv, .fla, or even .mov files. Recently I've seen
several .dat files, which play in Win Media Player as .wmv files (using
object properties)

It seems this might be useful as a way to protect video from download but
I can't quite understand how it works. Even looking at the code -

    <object data=" " type="video/x-ms-wmv"
                   width="640" height="480" align="middle">
      <param name="src" value=" " />
      <param name="autostart" value="true" />
      <param name="controller" value="true" />

Just shows me what I already know. Downloading the .dat file locally I
can't make it play in WinMedia Player, but I still don't understand how
one does this.

Someone please explain what I don't understand?

With my thanks,
Larry L

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