It likely means that there is a DLL file that is not registered in your windows registry.

Did a quick check and found the following. Can give no guarantees of its outcome. Personally I would leave well enough alone unless you absolutely need to view the file:-


http://www.hitsquad.com/smm/programs...ages/3096.html

In Reply to: "CLASS NOT REGISTERED" posted by rudy on March 26, 2002 at 12:06:54:

Win Media Player 9 fails to load the libraries necessary to activate many streaming audio and video windows. The libraries are referred to as DLL files and they reside in your windows/system directory.

The solution is to:

1. Download Win Media Player 7.1 from the MS
site;

2. Disconnect from your internet connection;

3. Close all other programs;

4. Activate the 7.1 setup program;

5. Select "reinstall all components";

6. The program will advise that setup has failed
(its looking for files over the internet),
then force you to reboot;

7. When you reboot, 7.1 setup will begin
updating your windows settings. Actually,
it will be loading and registering the
libraries you need to open streaming windows;

8. WinMedPlyr 9 will remain intact; open and use
it as normal. You may find need for various
additional codecs. One package resides in
the MS download site, the others are on
divx.com or moviecodec.com.