Stop default app from launching

Does anyone know how to prevent the default application for video from lauching when I choose to open a video file?  The default program doesn't want to play my mkv files despite the manual saying this is a supported file type.  Or, is there something I can do to these video files before uploading them to my Playbook to increase the chances of them playing?
The default program does see those files and even shows the in-play type icon which would indicate that it CAN read them but when I try to open that file, it claims the file type is not supported.

1024*600 resolutions are perfect videos to play on playbook. You can convert the videos and upload it. I prefer you to convert it to mp4

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