Extension Warning Keeps Returning

Media Player34
Hey, I have a problem. When I try to play a *.ogm video file, Windows Media Player gives me the message



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The selected file has an extension that is not recognized by Windows Media Player, but the Player may still be able to play it. Because the extension is unknown by the Player, you should be sure that the file comes from a trustworthy source.



Do you want the Player to try to play the file?



[ ] Don't ask me again for this extension.



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I checked the 'Don't ask me again for this extension.' box, but everytime I play the same *.ogm video file or another *.ogm video file, it pops up that same warning. How do I get rid of it once and for all?


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